Figure 1. A fan curve illustrates the effect of static pressure on the performance of the fan. As the pressure (imposed by the resistance of the hood, exhaust duct, and tightness of the house) increases, the flow decreases.
This Thermador Professional Series 36 gas cooktop with hood can hold a fan as large as 1,400 CFM.
Figure 2. A house will become more depressurized as its tightness increases or as the size of the kitchen fan is increased.
A Thermador 49 Professional Series Wall Hood in stainless steel has the look and feel of a commercial fan, but it isn't subject to the same regulations. More Power! The Bigger is Better mentality strikes deep into the heart of the American home. Sure, American consumers will live with low flush toilets; they'll put up with low-wattage lights; but when it comes to the kitchen, they want the culinary equivalent of the sports utility vehicle. They are going for commercial quality and commercial-sized equipment in a big way. This means bigger refrigerators, larger stoves, and especially, bigger kitchen fans.
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