cool thanks for the info i think thats what im going to do.i wonder if a hepa filter would work better , i work at a machine shop n we got tons of them all diff sizes we use in our big air units we make. im just gonna vent out the chimmeny i found behind my flowering room i put a screen up today cuz i heard some bats lol,dont wanna open my grow room door n have a bunch fly out,but mabye i could use the bat shit
for fert if a make a screen to catch it. hmmmm