It's definitely for a future bathroom. One of the 1.5" is going to be your vanity drain. Usually there's a 2" under the slab that you can bust out of install a shower or bathtub. The 3" is definitely for a toilet. One of the 1.5" pipes is going to be your vent.


The guide to the 2021 IRC code regarding the ceiling height for the basement is provided below: New Construction: According to the IRC (International Residential Code), that basement ceiling height requirements for any habitable basement space, laundry rooms, toilet rooms, bathrooms, or corridors must meet a minimum standard height of 7 feet 0 inches in new ...


The Code requires a minimum ceiling height of 7’-0” for habitable spaces, unless 1) it’s a slopped ceiling, 2) basement remodel, 3) bathroom or shower. (See R305.1) Slopped ceilings shall have at least 50% with at least 7’ and slope down to no more than 5’. Basements can have 6’-8” ceilings in non-habitable spaces. (Habitable spaces are for living, ...


That rust looks very mild, even near the floor where I'd expect it to be the worst. I'd have no concerns about wiping it down and spraying it with a primer designed to handle rust. You probably wouldn't need to do much sanding unless you plan to leave it exposed and want it smooth. Even then I'd consider a textured paint.


Use the rest of the house as a guide. Add up the floor areas (example 1400 square feet) and add up all the return grille openings (example 7 grilles with total 14 sq ft,) In this example there is 1 sq ft return grille area per 100 sq ft floor area. So in this example your basement office return grille would be 1.4 square feet. A 6-inch round duct would be ...

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