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How many yards of cement in a 24x20 slab 4 in thick?
A minimum of 5.93 cubic yards is needed.
What size should the return air grill be for a 3ton ac unit?
referring to several manufacturer's recomendations, (Metal Aire, Titus etc.)for low noise you should use a 25x20 or 24x20 for a low nc. Of course, I'm sure every ac mechanic has his own "rule of thumb" and most would probably say you could get by with a 20x20, true, but again it's all based on air velocity thru the grille which relates to the noise created. Bigger is better. Good idea to line your ra plenum with something like eggcreate foam use on bedding to help with noise. I prefer a 2" pleated filter (no fiberglas) installed in a return air filter grille for easy change outs. They give best performance (dust trapping) for the money.
What would it cost to replace broken glass in a 24x20 window with a wood frame?
For a house window, you can check with a local glass company. Sometimes, your home insurance will cover replacement; however for such a small window the cost should not be high. I replaced a window once. Clear out the broken glass and putty. Take measurements of the window (3 for width at top, bottom and mid; 3 for height at left, right and middle) and go to a hardware or glass company and they will cut the piece for you. Buy the putty or plastic strips you need and then replace it. For a large window, it may be well worth paying the window company. For a stove window, you would probably contact the manufacturer of your stove. The type of glass and its replacement are probably specialized tasks. If the window has single pane glass you can remove the glazing putty and glazing points (metal) measure opening left, middle and right for height and top, middle and bottom for width. You can than take the measurements to a glass company and sometimes a hardware store and have a new piece cut. You will then need to purchase some glazing putty and have a putty knife to apply the glazing putty, you should be able to reuse the glazing points (they hold the glass in place). If you have double pane glass the chances are you will have to replace the whole window sash. There is the chance, depending on the age and manufacturer of the window, a glass company may be able to order a replacement double pane glass unit. You should first check with the window manufacturer. If you can't determine the window manufacturer have the glass company look at the window.
