Pitot tubes can be used to measure fluid flow velocity by measuring static and dynamic pressure difference. A pitot tube can be used to measure fluid flow velocity by converting the kinetic energy in a fluid flow to potential energy.

Basically, a pitot tube is used in wind tunnel experiments and on airplanes to measure flow speed. It’s a slender tube that has two holes on it. The side hole measures the static pressure. By measuring the difference between these pressures, you get the dynamic pressure, which can be used to calculate airspeed.

A Pitot tube measures total pressure and static pressure to determine the velocity pressure from which air velocity can be derived. The Pitot tube is inserted into the duct with the tip pointed toward the airflow. The manometer will then display velocity pressure which can be converted to velocity.

Instead of separate pitot and static ports, a pitot-static tube (also called a Prandtl tube) may be employed, which has a second tube coaxial with the pitot tube with holes on the sides, outside the direct airflow, to measure the static pressure.

CFM means Cubic Feet per Minute. CFM measures the volume of air in cubic feet for each minute it moves. In the case of an air compressor, CFM indicates how much air can move per minute.

Good CFM ranges from 4,000 to 5,000. Better ranges from 5,000 to 6,000. Best is over 6,000.

One cfm is needed per square foot (1 cfm/sq ft) of floor area. This is the average air quantity required for a room or an entire building. This number is based upon an averaged heat load calculation for comfort cooling. There is an assumption of an 8-ft ceiling, no unusual window areas, and average insulation.

430 cfm

For a 5×5 tent, it’s best to use about 1000 watts (High-Pressure Sodium) lights. HPS lights appear to be yellow in color, but these have the color spectrums yellow and red. Both spectrums are great for flowering plants. However, this doesn’t mean that HPS can only be used for flowering plants.

Well-Known Member. If the hood is air cooled get a six or eight inch inline fan for it. Mount the fan outside the tent close to the hole going to.

To determine what your CFM requirements are, simply divide the volume of your room by 3 minutes. Sticking with our example of a 350 cubic foot grow area, we would divide 350 Cubic Feet / 3 minutes to come up with a number of roughly 166.67 CFM.

It is wise to factor in a 10% -25% drop in airflow due to the resistance of pulling through the carbon filter. Just remember, if you are running an exhaust system, DO NOT choose a fan that will exceed the exhaust rating of your filter.