yeah, I agree. But... sometimes you find all the foam has degraded almost completely. Just like some loud speaker foam surrounds, falling apart when touched.

alistair

On 2012-05-05, at 7:22 PM, David Beierl wrote:

> At 10:20 PM 5/5/2012, Alistair Bell wrote:
>> *if* you choose to replace the foam, use open cell, soft foam. Need good compliance with those low closing forces David mentions.
> 
> Certainly agree with that part.  But I do recommend replacing foam on everything except the swinging flaps operated solely by airflow.
> 
> d