Medrec Martin wrote:Quick question, how low from the floor can I get away putting the exhaust flu? I figured 2 - 3 inches but the lower the better. Even though this is an 8" system the flu is 10" and will shrink down to 8" (as it exits the masonry and enters the room) with the addition of the an inner liner of ceramic blanket through the wall and outside. Thanks.
Scots John wrote:I am no expert but assuming the blocks are for storing heat, am not sure if filling them with insulation is a good idear?
Gerry Parent wrote:
Hi Medrec, Scots is correct. Filling the brick holes with perlite is taking away at least half of your thermal mass and ability to store heat. It would be much better to fill with a sand/clay mix (and even stuff small rocks in there). The walls won't get overly warm so as long as you leave a gap between the blocks and the vinyl wall, you should be fine.
The exhaust entrance should be low as you mentioned. A small lip is helpful to allow ash buildup over time and not block the entrance.