How many times a hour should you recirculate air in an hour?

Is 10mm equals to 1dm? How many square feet in a 6x12 tile? What is a two demensional figures? What is 534307 rounded to nearest hundred thousand? What is 3 20ths in simplest form? 6x-3y equals 30and4x equals 2-y then find x plus y? What two numbers do you divide to get 125? Is fifty hundredths less than one half? How do you write 50 to 80 in roman figure? What does dispatched within one or two weeks mean? Is the number 114 prime or composite? Where in bible scriptures does it say that Jesus Christ arose the first time? What are multiples of 288? How many more vertices does a rectanguler prism have than a revtangular pyramid? What is the decimal for 7 over 500? What are the uses of microscopes in everyday life? Which is greater 3 10th's or 2 7ths? What is any number that cannot be written as quotient of two numbers? What two events happened in the 16th and 17th century helped critcal methods? 8 tenths 5 hundredths equal how many thousandths?