Published at Saturday, January 19th 2019. by Pedersen Wilda in Kitchen Window and Ventilation Hood.
Since most residential kitchens are adequately served by a 150-cfm or 250-cfm range hood, it comes as no surprise that a 1,200-cfm range hood can cause depressurization and backdrafting problems. However, the homeowner’s claim that GE had never heard of such problems needed to be verified, so I set out to discover whether GE’s experts are really as clueless as Morris alleged.
As a stop-gap measure, a homeowner with backdrafting problems can open a window near the kitchen every time the range-hood fan is turned on. Although this solution works, it won’t satisfy most homeowners, and builders who suggest this remedy may still be legally liable for future backdrafting problems.
One of the most dramatic ways to make a statement in your kitchen is to include a custom designed range hood. Whether you adorn it with beautiful corbels and turned spindles and storage options or other embellishments, or keep it simple and classic, you will create a wonderful focal point for the room. Let’s take a look at a range (no pun intended!) of styles, colors and customization.
Here’s the new IRC provision, which is found in section M1503.4: “Exhaust hood systems capable of exhausting in excess of 400 cfm shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.
So where does a powerful range-hood fan get its makeup air? If the house doesn’t have enough random air leaks around windows, doors, and mudsills, the makeup air is often pulled backwards through water-heater flues or down wood-burning chimneys — a phenomenon called backdrafting. Since the flue gases of some combustion appliances can include carbon monoxide, backdrafting is dangerous. In some cases, it can be life-threatening.
Another consideration is location in the room. Curtains should not be near the stove or too close to splash-back from the sink. Judy Soccio of Couture Window Art says to keep treatments over the sink short—and that includes any cords. Think about how much and what you cook, too: If odors and grease are an issue, Judy says, choose washable fabrics or those with Crypton or Microban.
Follow the heating equipment manufacturer’s guideline and safety standards such as those published by the National Fire Protection Association (NFPA), and the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), and the local code authorities.
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