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Date:         Mon, 10 Dec 2012 16:48:36 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Is it open-cell foam if it doesn't say closed-cell? (heater
              flap material)
Comments: To: Mike South <msouth@GMAIL.COM>
In-Reply-To:  <CAN483vej1nPPy+DEBuWPebphuHcdxUQwH91_82cch+hC_d065g@mail.g
              mail.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 01:19 PM 12/10/2012, Mike South wrote: >Is the difference just that one is porous like a natural sponge and one is >formed of a bunch of closed bubbles stuck together? I saw a lot of >recommendations that you use "open-cell foam", so I guess I'm wondering if >that's the "default foam" :).

Open- and closed-cell foams are as you say. If not specified you don't really know which it is. All else equal the closed-cell foam will be harder to compress because you can't squeeze the air out of it, but foam density, material etc. also influence how soft a foam is. It's been too long since I've been in a heater box (it's hanging over my head, though) and I've forgotten what I learned while inside them, but in general you don't have much force to operate the flaps, so you have to have a light soft foam to be able to compress the hinge side enough so the far edge seals.

Yrs, d


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