Recently we purchase a combination Samsung microwave / range hood. The venting system is 4-speed using 2 backward impeller fans. I measured the exhaust flow at the highest speed on the output to be…Continue
Started this discussion. Last reply by Roman Oct 18, 2013.
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"Hi Paul and Chris
I appreciate your helpfull suggestions regarding different airflow measuring techniques.
I chose the anemometer approach due to its simplicity as well as being able to easily average 9 readings over the scanned…"
"I second Paul's suggestion to use a duct tester and a cardboard box to measure the range hood flow.
It sounds like there are multiple inlets on this model, though. So you have to be sure that the box captures all of them.…"
"A duct tester can be used to test a range hood pretty effectively if you can create a box to go under the whole assembly. The duct tester works as a powered flow hood so the air going through the fan in the hood should equal the air going…"
"Home Energy Magazin has a picture of how to use a box to measure flow at a range hood from an August 2012 article. You can use the Energy Conservatory Flow Meter, or make a similar box and cut a hole. Simply poke a hole for a manometer…"
"We have measured the airflow with a cardboard tunnel and anemometer.
Can you provide a sketch of your method and we will try it. There is some confusion where you are suggesting in placing the manometer probe in relation to the 5 x 5 orifice…"
"There are several factors affecting the effectiveness of range hoods, height, length and width, and CFM. A fairly accurate way to measure the CFM flow is tape a corrugated cardboard box across the range hood to completely seal it off, then cut a…"
Great question! You have run into the dilemma of installing a microwave / range hood! None of them pull enough air(as you said, 100 cfm), as tested by the only trusted authority on appliances and home energy, Consumer Reports.
"Hi Roman -- this may sound too simple but this test answered some questions for me about my microwave/exhaust combo. Open your kitchen door or window after you turn your fan on and see if it doesn't improve the draft. My 1990's…"
"The rated CFM by Samsung is 400.
We measured the airflow at the exhaust using a shroud and a Reed vane anemometer to be ~200 CFM on the floor before the unit was installed. We repeated the measurement after installation at the end of the 5-in…"
"Very few if any microwave range hoods are HVI tested, so you will likely not find an HVI-rated airflow.
Which device/method did you use to measure the airflow at the inlet and at the vent cap outlet? There is a lot of variation in the…"
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