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Copper vs. Aluminum Service Wire - GreenBuildingAdvisor There is a special rule in the electric code (Table 310 51 (B) (7) that allows 2 0 copper, or 4 0 aluminum, to be used for 200A residential services Your electrician is correct with this wire sizing in this case Note that when you mention 2 0 copper is good for 195A, and 4 0 aluminum is good for 205 amps, you are reading those ampacities from the 90*C column You need to use the 75*C column
Best Location for HVAC Supply and Returns - GreenBuildingAdvisor I’ve had a Manual J S done, but I am concerned that the existing supply (shown in red) returns (shown in blue) weren’t well thought out… master bedroom supply blows directly on the bed instead of towards windows or they blow directly on the ceiling fan, all the bedrooms (but bedroom 4) office rely on door undercuts for their returns
Improving Indoor Air With a DIY Portable Air Cleaner Luke assembling a high-MERV portable air cleaner for the Energy Vanguard office Finally, turn the filters over and tape the box fan to the other end I used blue painters’ tape, but you can use duct tape if you’d like (Just don’t use duct tape on ducts!) The photo at the top of this article shows the assembled DIY MERV-13 portable air
Supply Air Filtration and Airflow Pressure - GreenBuildingAdvisor In our office, we got a similar result, although our pressure drop is a bit higher We have an Aprilaire filter that’s also 20″ x 20″ but it’s a 4-inch-deep filter in a cabinet near the ducted minisplit air handler
Largest Possible Residential Electrical Panel - GreenBuildingAdvisor The largest standard residential electrical panel is a 200A panel You want to make sure you get a true 40 space panel too, not one of the "20 space, 40 circuit" panels that requires the use of tandem breakers and is a much tighter fit for wiring The "400A" services are really 320A continous, and typically feed two standard 200A panels with seperate disconnects You can put additional 200A
Filter Location Options for Ducted Minisplits - GreenBuildingAdvisor The 45deg filter box similar to the FMB ones works well when the unit is installed in a basement or crawlspace where you have space to remove the filters Also I would rather have a filter grill with a standard sized filter (16x25x4 or 20x25x4) instead of the 14x20x2