Roman
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Range Hood Draft
22 Replies

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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Roman replied to Roman's discussion Range Hood Draft
"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…"
Oct 18, 2013
Chris Stratton replied to Roman's discussion Range Hood Draft
"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.…"
Oct 18, 2013
Paul Raymer replied to Roman's discussion Range Hood Draft
"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…"
Oct 18, 2013
Dale Sherman replied to Roman's discussion Range Hood Draft
"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…"
Oct 16, 2013
Roman replied to Roman's discussion Range Hood Draft
"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…"
Oct 15, 2013
Dale@EnergyWright replied to Roman's discussion Range Hood Draft
"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…"
Oct 15, 2013
Tom Delconte replied to Roman's discussion Range Hood Draft
"Hello Eric, 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. If…"
Oct 8, 2013
Kari Sauder replied to Roman's discussion Range Hood Draft
"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…"
Oct 7, 2013
Roman replied to Roman's discussion Range Hood Draft
"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…"
Oct 5, 2013
Chris Stratton replied to Roman's discussion Range Hood Draft
"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…"
Sep 27, 2013
Eric Kjelshus replied to Roman's discussion Range Hood Draft
"I do not see a fan chart or fan curves.   Hard to a test and balance  with out a start point.   "
Sep 27, 2013
Roman replied to Roman's discussion Range Hood Draft
"No, i dont see it rated by HVI.org.   I have iploaded the product specs.   As you can see, Samsung rates this unit at 400CFM, yet before it was installed over the range, the best we could measure at the exhaust while still on the ground…"
Sep 27, 2013
Eric Kjelshus replied to Roman's discussion Range Hood Draft
"is it HVI.org rated?"
Sep 27, 2013
Roman replied to Roman's discussion Range Hood Draft
"We disconnected the exhaust end of the pipe as mentioned above; the air flow is almost the same as at the exhaust flange of the microwave itself ~200 CFM. Dispite the 5-in flex pipe, it is short run - only 7 ft."
Sep 27, 2013
Eric Kjelshus replied to Roman's discussion Range Hood Draft
"I done a lot of testing with small fans-  30% of rated CFM is norm.  If two damper in line  it can cut the air flow in half.  My bath fan rated for 50 CFM  now 4"  steel pipe sealed very well,  35 feet of pipe…"
Sep 26, 2013
Bob Blanchette replied to Roman's discussion Range Hood Draft
"How about pulling the microwave and do the test free standing w/o ductwork? The extra air has to be coming from somewhere or your test method/equipment is faulty."
Sep 24, 2013

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