APY. Annual Percentage Rate (APR) is normally used when you borrow money, such as mortgage loan. It is an annual interest rate without taking the compounding of interest within that year. For example, if a mortgage rate is 6% APR.It means, you will need to pay an interest of 6%/12 = 0.5% every month.ompound Interest Calculator. The Compound Interest Calculator can be used to compare the interest rates of different compound periods. By definition, the APR is the interest rate compounded monthly and APY is the interest rate compounded annually.
Locate the register or grille you are replacing and note if it is for a wall, ceiling or floor. Remove the screws that hold the vent in place. Pull the vent forward and out of the opening. Measure the size of the air duct opening. Do not measure the old register or vent.
Air filter kit-adapts any standard MagnehelicÂ® gage for use as an air filter gage. Includes aluminum surface mounting bracket with screws, (2) 5 ft (1.5 m) lengths of 1/4 aluminum tubing, (2) static pressure tips & (2) molded plastic vent valves.here are two ways to measure air flow in process ducts. The most common means is the use of a Series 2000 MagnehelicÂ® Differential Pressure Gage. This gage can be ordered with a square root output that will read in flow units. You will have to specify the maximum differential pressure at your desired flow rate.