So if I was at 1500cfm before I started renovating(this is with atmospherically venting furnae and water heater getting tons of air sucked through too), two box fans would pull or push enough for a DIY blower door? I was thinking of pulling my furnace blower(furnace rated for 800cfm on high for a 2 ton a/c) and sealing it around a window and pushing air into the house because I thought axial/blade fans weren't too good at generating/working against pressure.
It would be fairly difficult to generate too much pressure/vacuum on the house, wouldn't it? Considering 50 pascals is 0.00725PSI or about 0.2" water.
Also, where do you buy the smoke pencils? I've been having trouble working with following birthday candle flames against metal ductwork and incense just aren't making the smoke needed.
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