Passive Heat Flex

Passive Heat Flex Banner

Go Ahead—Frame & Finish with Wood.

The Passive Heat Flex system efficiently redirects heat away from the top of the fireplace to ensure safe installation in various framing applications. A sheet metal topper captures rising heat, which is then transferred through DuraFlex ducting to the passive heat flex box where it recirculates back into the room through our standardized louvered release.

This system helps maintain proper clearances while allowing you to frame and finish around the fireplace with combustible materials, ensuring both safety and design flexibility.

PHS-4

PHS-3

PHS-5

Passive Heat Flex Dimensions

Passive Heat Flex SketchUp

Passive Heat Flex CAD

Front Facing

See Through

Left Corner

Right Corner

Double Corner

Room Definer

Passage

Traditional

Indoor Outdoor

Manual & More

Passive Heat Flex Box
Flare Model	Part Name	Open Air Flow [SQ"]	Flex Size	# Of Flex
Flare 30	HFB-70	70 SQ"	4"	2
Flare Passage	HFB-70	70 SQ"	4"	4
Flare 45	HFB-100	100 SQ"	4"	4
Flare 50	HFB-100	100 SQ"	4"	4
Traditional 42	HFB-100	100 SQ"	4"	4
Traditional 46	HFB-100	100 SQ"	4"	4
Flare 60	HFB-120	120 SQ"	6"	4
Flare 70	HFB-120	120 SQ"	6"	4
Flare 80	HFB-180	180 SQ"	6"	6
Flare 100	HFB-180	180 SQ"	6"	6

Passive Heat Flex - Louvers
Flare Model	Part Name	Dimension (Inches)	Open Air Flow [SQ"]
Flare 30	LUV70	32 1/4 x 2 5/32	70"
Flare Passage	LUV70	32 1/4 x 2 5/32	70"
Flare 45	LUV100	46 3/64 x 2 5/32	100"
Flare 50	LUV100	46 3/64 x 2 5/32	100"
Traditional 42	LUV100	46 3/64 x 2 5/32	100"
Traditional 46	LUV100	46 3/64 x 2 5/32	100"
Flare 60	LUV120	55 19/64 x 2 5/32	120"
Flare 70	LUV120	55 19/64 x 2 5/32	120"
Flare 80	LUV180	82 15/16 x 2 5/32	180"
Flare 100	LUV180	82 15/16 x 2 5/32	180"

Passive Heat Flex Kits
Model Size	Part Name	Description	Flex Quantity/Size	SKU
30	HFPK-70	Passive Heat Flex Kit for 30" Fireplace with White Louver	2 / 4"	HFPK70
Passage	HFPK-70	Passive Heat Flex Kit for 30" Fireplace with White Louver	4 / 4"	HFPK70
45	HFPK-100	Passive Heat Flex Kit for 45" Fireplace with White Louver	4 / 4"	HFPK100
50	HFPK-100	Passive Heat Flex Kit for 50" Fireplace with White Louver	4 / 4"	HFPK100
Traditional 42	HFPK-100	Passive Heat Flex Kit for Traditional Fireplace with White Louver	4 / 4"	HFPK100
Traditional 46	HFPK-100	Passive Heat Flex Kit for Traditional Fireplace with White Louver	4 / 4"	HFPK100
60	HFPK-120	Passive Heat Flex Kit for 60" Fireplace with White Louver	4 / 6"	HFPK120
70	HFPK-120	Passive Heat Flex Kit for 70" Fireplace with White Louver	4 / 6"	HFPK120
80	HFPK-180	Passive Heat Flex Kit for 80" Fireplace with White Louver	6 / 6"	HFPK180
100	HFPK-180	Passive Heat Flex Kit for 100" Fireplace with White Louver	6 / 6"	HFPK180

PASSIVE HEAT FLEX SPEC CENTER

[testimonials]

Flare is a Top rated company to work with. Professional , courteous and knowledgeable staff always going that extra step! They are always able to answer any questions, help with any applications and deliver the product fast and efficiently. There products are top of the line and a pleasure to install and work with. Very proud to be able to offer the line to my clients!.

Michael Melahn, NFI certified dealer

Kelli Gibson, Architecture firm

I work at an Architecture firm and called for some technical assistance on a room-dividing unit. In the past, other companies have just answered my questions with as little detail as possible just to get off the phone. The guy who answered my phone call at Flare Fireplaces (Kyle) went above and beyond and walked me through the entire set up of the unit, toured me through different diagrams on the website so I could visually see what he had explained, and then followed up with an email with EVERYTHING I needed. I tend to ask a lot of questions, and I never once felt like he was annoyed or that he was trying to pawn me off. I never leave 'reviews', but this was such a positive experience, I had to leave one. You can tell this is a great company and the employees are very passionate about their product. I highly recommend!.

Our Company Mission

Flare Fireplaces is where innovation, quality and luxury come together to form new ideas. By combining superior raw materials, contemporary design, creative technology and a frameless way of thinking we have created a full line of indoor & outdoor linear, modern fireplaces that are luxurious, simple to operate, and efficient.

The Flare Philosophy

Simplification and Quality makes a better lasting product.

The Flare Promise

We will continue to listen to our customers , dealers and distributors to make sure we update,change and improve our product to create the best liner fireplace on the market.

Custom Fireplace Projects

Modern custom fireplaces for homes and businesses.Flare Fireplaces offers 85 different models of linear fireplaces. For customers looking for the best modern fireplace, see-through, indoor, outdoor, or corner fireplace, we offer the most extensive selection. Our models are available in lengths of up to over 100 inches and in glass heights of 16, 24, and 30 inches. Flare Fireplaces also offers custom fireplace made to order based on your requirements. .