Should a green home require a piece of ventilation equipment like our Zehnder HRV? Photo Credit: Alex Wilson One of the features in our new house that I’m most excited about barely raises an eyebrow with some of our visitors: the ventilation system. I believe we have the highest-efficiency heat-recovery ventilator (HRV) on the market—or at least it’s right up there near the top. But first, a lot of people may be wondering, should a 'green' home require mechanical ventilation? A lot of people might think that this is just the kind of energy-consuming system that homes should be getting away from—while cracking windows for fresh air. Why ventilate? For centuries homes weren’t ventilated, and they did all right, didn’t they? Why do we need to go to all this effort (and often considerable expense) to ventilate houses today? There are several reasons that ventilation is more important today than it was long ago. Most importantly, houses 100 years ago were really leaky. Usually they didn’t have insulation in the walls, so fresh air could pretty easily enter through all the gaps, cracks, and holes in the building envelope. Also, the building materials used 100 years ago were mostly natural products that didn’t result in significant offgassing of volatile organic compounds (VOCs), formaldehyde, flame retardants, and other chemicals that are so prevalent in today’s building materials, furnishings, and other stuff. Jan 09, 2017 Best Royalty Free Music 2 views. Industrial ventilation a manual of recommended practice for. Acgih industrial ventilation manual free ebook. It just has to prove that D-Link's security claims were unfair and deceptive. D link webcam driver. Unlike private litigation, however, the FTC doesn't have to prove harm to bring an enforcement action under Section 5 of the FTC Act. ![]() Ventilation options Ventilation can take many different forms. Very generally, systems can be categorized into about a half-dozen generic types: • No ventilation. This is almost certainly the most common option in American homes. There is no mechanical system to remove stale indoor air (and moisture) or bring in fresh outside air. In the distant past, when buildings weren’t insulated, this strategy worked reasonably well—relying on the natural leakiness of the house. It’s worth noting, though, that even a leaky house doesn’t ensure good ventilation. For this strategy to work there has to be either a breeze outside or a significant difference in temperature between outdoor and indoors.
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