• Exterior vent for Active Heat Flex heat management system on wood siding, gently exhausting fireplace heat outside.

Want to remove the heat release?

Active Heat Flex pulls heat at the fireplace and vents it outside, so there’s no heat-release opening to design around. Plus, combustible framing and finishes are allowed when clearances are followed. As a result, you keep clean lines and protect the room, all while maintaining the 12″ clearance to a mounted TV.

Active Heat Flex System equipped on a Flare

Heat Flex - Active
ModelFan QuantityFlex Pipe Size / QuantiyNotes
301 Regular4" / 2
Passage1 Regular4" / 2
Traditional 421 Regular4" / 2
Traditional 461 Regular4" / 2
451 Regular4" / 2
501 Regular4" / 2
601 Regular4" / 2
701 Regular6" / 2
801 Large6" / 4Splitter Required
1001 Large6" / 4Splitter Required

Heat Flex Active - Kit
ModelPart NameDescriptionFlex Pipe Size / QuantitySKU
30HFAK-3070-INInline Active Heat Flex Kit for 30" Fireplace4" / 2HFAK3070I
PassageHFAK-3070-INInline Active Heat Flex Kit for a Passage Fireplace4" / 2HFAK3070I
Traditional 42HFAK-3070-INInline Active Heat Flex Kit for a Traditional Fireplace4" / 2HFAK3070I
Traditional 46HFAK-3070-INInline Active Heat Flex Kit for a Traditional Fireplace4" / 2HFAK3070I
45HFAK-3070-INInline Active Heat Flex Kit for 45" Fireplace4" / 2HFAK3070I
50HFAK-3070-INInline Active Heat Flex Kit for 50" Fireplace4" / 2HFAK3070I
60HFAK-3070-INInline Active Heat Flex Kit for 60" Fireplace4" / 2HFAK3070I
70HFAK-3070-INInline Active Heat Flex Kit for 70" Fireplace6" / 2HFAK3070I
80HFAK-8010-INInline Active Heat Flex Kit for 80" Fireplace6" / 4HFAK8010I
100HFAK-8010-INInline Active Heat Flex Kit for 100" Fireplace6" / 4HFAK8010I
30HFAK-3070-ENDEnd of Line Active Heat Flex Kit for 30" Fireplace4" / 2HFAK3070E
PassageHFAK-3070-ENDEnd of Line Active Heat Flex Kit for a Passage Fireplace4" / 2HFAK3070E
Traditional 42HFAK-3070-ENDEnd of Line Active Heat Flex Kit for a Traditional Fireplace4" / 2HFAK3070E
Traditional 46HFAK-3070-ENDEnd of Line Active Heat Flex Kit for a Traditional Fireplace4" / 2HFAK3070E
45HFAK-3070-ENDEnd of Line Active Heat Flex Kit for 45" Fireplace4" / 2HFAK3070E
50HFAK-3070-ENDEnd of Line Active Heat Flex Kit for 50" Fireplace4" / 2HFAK3070E
60HFAK-3070-ENDEnd of Line Active Heat Flex Kit for 60" Fireplace4" / 2HFAK3070E
70HFAK-3070-ENDEnd of Line Active Heat Flex Kit for 70" Fireplace6" / 2HFAK3070E
80HFAK-8010-ENDEnd of Line Active Heat Flex Kit for 80" Fireplace6" / 4HFAK8010E
100HFAK-8010-ENDEnd of Line Active Heat Flex Kit for 100" Fireplace6" / 4HFAK8010E

Dimensions – End Of Line Heat Flex Fan

What is the Active Heat Flex system?

The system uses a temperature sensor and a continuously monitored fan to pull heat from the fireplace and move it outside. As a result, surfaces near the fireplace and it’s opening stay cooler.

Does the system require a heat release?

No heat release is required for fireplaces equipped with the Active Heat Flex system.

Can I frame in uncovered combustibles?

Yes. However, you must follow all clearances specified in the manual.

What are the basic clearances to wood framing?

Maintain 3″ to the sides and back, and 4″ above. In addition, verify any local code requirements.

Can I mount a TV above a fireplace?

Yes, as close as 12″ from the glass opening, regardless of size, style, or safety barrier.

Will I get heat into the room?

No. Because the monitored fan continuously moves heat outside, none is recirculated.

How loud is the monitored fan?

It’s similar to a bathroom fan. To minimize noise, mount it further from the fireplace.

Can I retrofit this on an existing Flare Fireplace?

Yes, provided there is access to the cavity and walls for the flex and the fan.

Is there an inline fan option?

Yes, you can also equip your system with an inline fan, but must develop access to the fan for future service.