We all know the higher vs lower MERV filter deal: With higher MERV filters (MERV 11, 14), you get better filtration but higher resistance (more strain on AC, furnace). That’s because higher MERV filters have a higher pressure drop across the filter. What are pressure drops over different MERV filters, and how do MERV 6 … Read more
When adding soffit vents to an attic, you need to know how many soffit vents you need. More specifically, you want to figure out how much soffit vents you need (square feet of soffit). We are going to show you how you can easily estimate the number of soffit vents you need in the attic. … Read more
Every attic should be well insulated and well ventilated. We have covered the recommended attic R insulation values here. Here we are going to look at the ventilation part, specifically, what size attic fan you need in terms of CFMs. Attic fans come in all sizes; from the smallest 80 CFM attic fan to over … Read more
When buying air filters, we can be baffled by different air filter ratings like MERV and FPR (found on Home Depot filters). In order to figure out which filters have the same efficiency, we have to put MERV and FPR on the same denominator. We will look into FPR vs MERV rating, and include FPR … Read more
As we know, H13 and H14 are two classifications of HEPA filters. The difference between H13 and H14 HEPA filters is simple; H14 HEPA filters are better due to higher efficiency and lower penetration rate. When differentiating between H13 vs H14, it is crucial that we also understand the implications of using H14 over H13 … Read more
Every house needs adequate ventilation. It is the job of a whole house fan to provide this ventilation. In milder climates, you can even use whole house fans for cooling without the need for an air conditioning system. In order to do its job right, you obviously have to get the whole house fan size … Read more
CFMs. If you have been looking at the specs sheets of HVAC devices (ACs, furnaces, dehumidifiers, air purifiers, and so on) you have probably come across a unit labeled as CFM. What does CFM stand for in HVAC? In HVAC, CFM stands for Cubic Feet Per Minute. It is a standard unit of airflow volume. … Read more