Push Air Down, or Pull It Up Most large ceiling fans do one job: push air down onto the stock in summer. This one reverses. Run in the forward direction it creates a downward column for cooling; run in reverse it lifts warm air from the ridge and pushes it out towards the walls, which is what a ...

Air Movement at Building Scale Small propeller fans move air around themselves. A fan with a 1.83 m blade moves the air in the whole building. That difference is what makes this unit worth its frame: at 345 rpm the blade tips run a long way per revolution but slowly per second, so the fan shifts a ...

Two Wire Ends, One Clamp, Full Conductivity A joint in an electric fence is where current quietly disappears. Loose twists, corroded pliers marks and half-tightened nuts all add resistance, and the further the pulse has to travel the weaker it arrives. This split bolt clamp was designed for the ...

Covered Troughs Keep Water Cleaner for Longer An open trough collects whatever the wind delivers: dust, leaves, feathers and the occasional rodent. Each of those adds organic load, and organic load is what turns a clean basin into a green one within a fortnight. What the cover and balls do The ...