[Greenbuilding] Dryer vent backdraft solutions

[Bob Klahn]

Ben,
I recall an early manufacturer's suggestion for adapting a Heartland for 
this, but have never seen it tried.
It requires a roof cricket to align it properly and a stainless steel 
spring connecting the moveable cap with the weather cap to neutralize 
the weight of the sealing cap, since bath exhausts don't produce a 
strong enough flow to lift the cap (typically 45-90 [30-50 after duct 
resistance loss] cfm compared to 100 to 110 [60-80] cfm for a dryer.

It would take some modification and site tuning to get it working 
properly but may be worth a try.  If it works, I'd like to know so I can 
add it to my bag of tricks.

Bob Klahn

On 9/21/2011 12:07 PM, Benjamin Pratt wrote:
> Glad to hear this one works--anyone know of a roof vent for a bathroom
> fan that isn't leaky?
> Ben
>
> On Wed, Sep 21, 2011 at 8:19 AM, Ron Cascio<roncascio at verizon.net>  wrote:
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