The Kratki NADIA model is a steel wood-burning fireplace insert rated at 8 kW. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki NADIA model is a steel wood-burning fireplace insert rated at 10 kW. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY SLIM model is a steel wood-burning fireplace insert rated at 8 kW. With 83% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 14 kW, featuring left side glass. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ZUZIA ECO DECO model is a cast iron wood-burning fireplace insert rated at 12 kW, featuring right side glass and decorative DECO cast iron door. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki NADIA model is a steel wood-burning fireplace insert rated at 14 kW. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 14 kW, featuring right side glass. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki OLIWIA DECO model is a cast iron wood-burning fireplace insert rated at 16 kW, featuring decorative DECO cast iron door. With 76.6% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 14 kW, featuring double-sided tunnel design. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ZUZIA ECO DECO model is a cast iron wood-burning fireplace insert rated at 12 kW, featuring decorative DECO cast iron door. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki MBM model is a wood-burning fireplace insert with water jacket rated at 12 kW, featuring left side glass. With 85% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet. Its water jacket delivers 7 kW to the water to support radiator or underfloor heating.

The Kratki AMELIA DECO model is a cast iron wood-burning fireplace insert rated at 21 kW, featuring decorative DECO cast iron door. With 79.9% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 14 kW. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki SIMPLE model is a steel wood-burning fireplace insert rated at 6 kW, featuring left side glass. With 80.6% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 150 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 12 kW, featuring double-sided tunnel design. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 16 kW, featuring double-sided tunnel design. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI L model is a steel wood-burning fireplace insert rated at 12 kW. With 85.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki MBM model is a wood-burning fireplace insert with water jacket rated at 12 kW, featuring right side glass. With 85% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet. Its water jacket delivers 7 kW to the water to support radiator or underfloor heating.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 12 kW. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a steel wood-burning fireplace insert rated at 12 kW, featuring right side glass. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ZUZIA ECO model is a cast iron wood-burning fireplace insert rated at 12 kW. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI L model is a steel wood-burning fireplace insert rated at 12 kW, featuring left side glass. With 85.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki AMELIA model is a cast iron wood-burning fireplace insert rated at 21 kW. With 79.9% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki WIKTOR DECO model is a cast iron wood-burning fireplace insert rated at 14 kW, featuring decorative DECO cast iron door. With 79.5% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki OLIWIA model is a cast iron wood-burning fireplace insert rated at 16 kW. With 76.6% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI L model is a steel wood-burning fireplace insert rated at 12 kW, featuring right side glass. With 85.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a wood-burning fireplace insert with water jacket rated at 16 kW. With 84.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 10 kW to the water to support radiator or underfloor heating.

The Kratki FLOKI L model is a steel wood-burning fireplace insert rated at 12 kW, featuring black thermotec finish. With 85.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki LUCY model is a wood-burning fireplace insert with water jacket rated at 12 kW. With 82% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 7 kW to the water to support radiator or underfloor heating.

The Kratki LUCY model is a wood-burning fireplace insert with water jacket rated at 20 kW. With 82% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 13 kW to the water to support radiator or underfloor heating.

The Kratki ZUZIA DECO model is a wood-burning fireplace insert with water jacket rated at 12 kW, featuring decorative DECO cast iron door. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 8 kW to the water to support radiator or underfloor heating.

The Kratki FLOKI L model is a steel wood-burning fireplace insert rated at 12 kW, featuring left side glass and black thermotec finish. With 85.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI L model is a steel wood-burning fireplace insert rated at 12 kW, featuring right side glass and black thermotec finish. With 85.4% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI S model is a steel wood-burning fireplace insert rated at 8 kW, featuring black thermotec finish. With 79.7% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki ZOSIA DECO model is a wood-burning fireplace insert with water jacket rated at 14 kW, featuring decorative DECO cast iron door. With 85.7% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 6.5 kW to the water to support radiator or underfloor heating.

The Kratki MAJA DECO model is a cast iron wood-burning fireplace insert rated at 8 kW, featuring decorative DECO cast iron door. With 80.1% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI M model is a steel wood-burning fireplace insert rated at 10 kW. With 83.6% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ANTEK DECO model is a cast iron wood-burning fireplace insert rated at 10 kW, featuring decorative DECO cast iron door. With 76.9% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet.

The Kratki FLOKI S model is a steel wood-burning fireplace insert rated at 8 kW. With 79.7% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki WIKTOR model is a cast iron wood-burning fireplace insert rated at 14 kW. With 79.5% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI S model is a steel wood-burning fireplace insert rated at 8 kW, featuring right side glass and black thermotec finish. With 79.7% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki FLOKI M model is a steel wood-burning fireplace insert rated at 10 kW, featuring black thermotec finish. With 83.6% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI M model is a steel wood-burning fireplace insert rated at 10 kW, featuring left side glass. With 83.6% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI S model is a steel wood-burning fireplace insert rated at 8 kW, featuring left side glass. With 79.7% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki FLOKI S model is a steel wood-burning fireplace insert rated at 8 kW, featuring left side glass and black thermotec finish. With 79.7% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki FLOKI M model is a steel wood-burning fireplace insert rated at 10 kW, featuring right side glass. With 83.6% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI S model is a steel wood-burning fireplace insert rated at 8 kW, featuring right side glass. With 79.7% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 160 mm flue outlet.

The Kratki MAJA model is a cast iron wood-burning fireplace insert rated at 8 kW. With 80.1% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ZOSIA model is a cast iron wood-burning fireplace insert rated at 12 kW. With 83% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki FLOKI M model is a steel wood-burning fireplace insert rated at 10 kW, featuring right side glass and black thermotec finish. With 83.6% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki SIMPLE model is a cast iron wood-burning fireplace insert rated at 8 kW, featuring left side glass. With 80.1% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki SIMPLE model is a cast iron wood-burning fireplace insert rated at 8 kW, featuring right side glass. With 80.1% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ANTEK model is a cast iron wood-burning fireplace insert rated at 10 kW. With 76.9% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet.

The Kratki MBZ model is a wood-burning fireplace insert with water jacket rated at 13 kW, featuring lift-up guillotine door and double glazing. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 7 kW to the water to support radiator or underfloor heating.

The Kratki MBZ model is a steel wood-burning fireplace insert rated at 13 kW, featuring right side glass and curved corner glass. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki MILA model is a wood-burning fireplace insert with water jacket rated at 24 kW, featuring lift-up guillotine door and double glazing. With 78% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 12 kW to the water to support radiator or underfloor heating.

The Kratki MAJA model is a wood-burning fireplace insert with water jacket rated at 8 kW, featuring lift-up guillotine door. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet. Its water jacket delivers 6 kW to the water to support radiator or underfloor heating.

The Kratki AMELIA model is a wood-burning fireplace insert with water jacket rated at 15 kW, featuring lift-up guillotine door. With 85% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 220 mm flue outlet. Its water jacket delivers 8 kW to the water to support radiator or underfloor heating.

The Kratki KARI 80 model is a steel wood-burning stove rated at 12 kW, featuring black thermotec finish. With 75% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 180 mm flue.

The Kratki JUNO model is a steel wood-burning stove rated at 12 kW. With 75% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 160 mm flue.

The Kratki MBZ model is a steel wood-burning fireplace insert rated at 13 kW, featuring left side glass and curved corner glass. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki MBO model is a steel wood-burning fireplace insert rated at 15 kW, featuring left side glass and lift-up guillotine door and curved corner glass. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki MBM model is a steel wood-burning fireplace insert rated at 10 kW, featuring right side glass and curved corner glass. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki MBM model is a steel wood-burning fireplace insert rated at 10 kW, featuring left side glass and curved corner glass. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki KARI 95 model is a steel wood-burning stove rated at 14 kW, featuring black thermotec finish. With 83% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 200 mm flue.

The Kratki JUNO model is a steel wood-burning stove rated at 12 kW. With 75% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 160 mm flue.

The Kratki MBO model is a steel wood-burning fireplace insert rated at 15 kW, featuring left side glass. With 81% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki ZUZIA DECO model is a wood-burning fireplace insert with water jacket rated at 12 kW, featuring right side glass and decorative DECO cast iron door. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 8 kW to the water to support radiator or underfloor heating.

The Kratki MAJA model is a wood-burning fireplace insert with water jacket rated at 8 kW, featuring right side glass. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet. Its water jacket delivers 6 kW to the water to support radiator or underfloor heating.

The Kratki BLANKA model is a steel wood-burning fireplace insert rated at 11 kW, featuring glass on three sides. With 78% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet.

The Kratki AQUARIO A model is a wood-burning fireplace insert with water jacket rated at 18 kW. With 84% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 12.5 kW to the water to support radiator or underfloor heating.

The Kratki MAJA model is a wood-burning fireplace insert with water jacket rated at 8 kW, featuring left side glass. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 180 mm flue outlet. Its water jacket delivers 6 kW to the water to support radiator or underfloor heating.

The Kratki ZUZIA model is a wood-burning fireplace insert with water jacket rated at 12 kW, featuring right side glass. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 8 kW to the water to support radiator or underfloor heating.

The Kratki ZUZIA model is a wood-burning fireplace insert with water jacket rated at 12 kW. With 81% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It is designed to be built into a masonry fireplace or a custom surround, with a Ø 200 mm flue outlet. Its water jacket delivers 8 kW to the water to support radiator or underfloor heating.

The Kratki K9 model is a cast iron wood-burning stove rated at 10 kW. With 75% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 150 mm flue.

The Kratki VEGA model is a steel wood-burning stove rated at 6 kW. With 78% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 130 mm flue.

The Kratki ENYO model is a steel wood-burning stove rated at 8 kW. With 80% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 150 mm flue.

The Kratki FALCON VIEW model is a steel wood-burning stove rated at 10 kW. With 82% efficiency and energy class A+, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 150 mm flue.

The Kratki K8 model is a cast iron wood-burning stove rated at 9 kW. With 75% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 130 mm flue.

The Kratki K6 model is a cast iron wood-burning stove rated at 8 kW. With 70% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 130 mm flue.

The Kratki BJORN/W model is a steel wood-burning stove rated at 8 kW. With 78.4% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 150 mm flue.

The Kratki TOFA model is a steel wood-burning stove rated at 8 kW. With 79% efficiency and energy class A, it makes the most of your firewood and offers a wide view of the flames. It stands freely in the room and connects to a Ø 150 mm flue.