backdraft dampers for central heating hookup to zero clearance fireplace

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OK I found the NZ62HC installation manual on the web (the NZ62HC is a central heating kit sold by Napoleon for their ZC fireplace line, and this kit is around a thousand bucks!!), looks like all I really need to make this work myself is an inline blower and a pair of 8" backdraft dampers......the blower I have covered, but can anyone tell me where to get a set of these tin 8" backdraft dampers? They mount on the stove surround and are what takes the heat off of the unit and keeps cold air from being backdrafted into the surround when the blower is NOT in operation....any lead would be appreciated...I wanna get his NZ300 up and running in a week or so....
 
Backdraft damper like these are commonly used for wood furnaces and their ducting. They are spring loaded and rated for high heat. Is this what your looking for? One thing I always questioned about these dampers is if a power outage would occur, would it allow heat buildup due to no fan to open them? If that's a potential problem then adding manual dampers may be easier.

http://m.grainger.com/search/ProductSearch_item?item=5C525
 
laynes69 said:
Backdraft damper like these are commonly used for wood furnaces and their ducting. They are spring loaded and rated for high heat. Is this what your looking for? One thing I always questioned about these dampers is if a power outage would occur, would it allow heat buildup due to no fan to open them? If that's a potential problem then adding manual dampers may be easier.

http://m.grainger.com/search/ProductSearch_item?item=5C525

Laynes69, that is pretty much exactly what I need......you do bring up a good point, but I would think that heat build-up would not pose a problem AS LONG AS your duct pipe maintains the proper clearance to combustibles (which from the information I am seeing is usually around 1" on central hot air ducts and gravity hot air ducts from these wood burning appliances).......thank you for the link, you just made my morning!
 
plus in my particular application, I will be dropping the ducts under the raised hearth which not take heat unless the blower was pulling the heat.....if the blower is not running the heat should not be able to sink at all.....at least according to the laws of physics!.......lol.....
 
The heat buildup poses problems in some furnaces, it probably not a problem with what your installing. Some backdraft dampers will have a foam gasket inside them for a positive seal, so I would shy away from them or remove the foam. Glad to be a help. Check amazon.com also, they may have a better price. Good luck with your install.
 
laynes69 said:
The heat buildup poses problems in some furnaces, it probably not a problem with what your installing. Some backdraft dampers will have a foam gasket inside them for a positive seal, so I would shy away from them or remove the foam. Glad to be a help. Check amazon.com also, they may have a better price. Good luck with your install.

laynes69 I will shy away from the foam gasket....heck the more I think about it I may not even need dampers being I am going down and under my hearth instead of up....I don't think I will need them for that, but I may install them anyway....BTW it's nice to see someone else runnin those old Stihl 041's.......my favorite saws of all time.....I have around 15 of them, the two I run most of the time are the 041 Supers, with the 72cc cylinders......they'll run a 32" bar all day long.....take care and thanks for the help!
 
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