My work is primarily remodeling, and keeping dust out of inhabited spaces is always a challenge. To that end, I salvaged a squirrel-cage blower out of a central-heating system and attached a 6-in. flexible hose to its outlet port, as shown in the drawing. This rig allows me to exhaust the dust kicked up by demolition, drywall and carpentry, as well as paint fumes and hot air.
The hose can be snaked through another room to reach a window on the downwind side of the building, and the fan is quiet, so I don’t mind running it a lot. The fan is strong enough that it creates a negative pressure in the work area, which keeps construction dust from getting through the inevitable small holes in the plastic that I put between work and living areas. To be on the safe side I put a screen over the blower’s inlet. For top performance I use rags to plug the openings around the hose where it exits the window.
Alan Bellamy, Berkeley, CA