Box fans are normally hamster wheel type fans and not necessarily in a box . The best way for a fan to run more efficiently and with less noise is to have the fan running into ducting which is bigger than the said fan . Eight inch fan ten inch ducting. If it's also extracting hot air your best if possible running the duct upwards like a chimney and have the added help of natural air convection. The biggest fans can be slowed down but smaller fans can't be made to run or push more air than they already do .
Sent from a green pleasant land
Bookmarks