Woodshop super-ventilation: Any reason to air seal / insulate?
我要在波特兰市外建造900平方英尺的木匠，或（4C气候区）。
Based on Bill Pentz’s research, the best way to avoid fine dust-related health problems is to ventilate all sanding/cutting tools to the outside with ~ 1000 CFM of air, which is enough flow to fully change the shop air every 7 minutes.
Recirculating air filters don’t cut it for fine dust — it has to vent outside.
将此气流作为给定，是否有任何理由：
1)担心空气密封墙envelope? (There will be an open garage door or intake fan providing makeup air.)
2）完全隔离商店吗？
It seems to me that the constant airflow would effectively keep the internal shop conditions the same as the outside (sans rain).
至于冬季的舒适性，我最好的选择似乎是辐射热盘，因为加热1000 cfm的化妆空气将是巨大的废物。
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Replies
绝缘和空气密封将主要是因为没有人会积极打磨和切割 - 无论是在执行其他任务时，还是没有人在商店里。您可能会认为当没有人存在时，您不会打扰供暖，因此不需要绝缘，但是如果您整天都在辐射热量，那么商店中的热量也会被它加热空气不多，当您关闭气流和加热器时，当木材中的某些热量和设备进入空气时，气温实际上会升高。因此，您将保留一些热量，并防止过夜温度下降到外部的内部。
我不确定这是每日使用专业人士还是半职业商店，还是周末的业余爱好商店。但是，无论哪种情况，避免在没有人存在的情况下避免温度波动都是有用的，因为温度波动意味着相对湿度的波动。湿度的波动不利于木材稳定性，湿度向上摆动可以制定工具。
A large HRV on your exhaust air would pre-heat the makeup air nicely, but would be prone to clogging. It would need the large-particle dust removed before the heat exchanger, but it would probably still slowly get coated with fine dust and lose heat exchange efficiency and air flow. So you'd want one that could be vacuumed out and/or washed out easily.
Air sealing is pretty easy. I'd do, just so if you ever decide on another use for the space, you won't have to retrofit.
Kevin,
我们在类似的气候（温哥华岛）有一家大商店，并决定将功能分开。主要的木工区域被覆盖，但没有加热。我们唯一的问题是必须密封桌子锯和木匠的表面，以防止表面生锈。该商店的四分之一是有条件的，为窑炉干燥的木材提供了存储，组装和整理。产生细颗粒的活动是在带有防尘口罩的覆盖区域中进行的。预留了第三个小区域，以存放我们不想冻结的饰面。它通风良好，但保持在冰点上方。
Charlie: It'd be a semi-pro shop used daily by one person. I have no idea if there are 1000 CFM HRVs and how much they cost --- it seems like most homes need on the order of ~200 CFM for ventilation.
马尔科姆：分解为条件/无条件的空间是一个有趣的想法。在较大的无条件空间内有条件的“建筑物”，或者是带有宽敞封闭门廊的小条件建筑。
As for rust, is that from condensation due to large air temperature swings in the unconditioned space?
Kevin, It's pretty minor and no different than storing your tools in an unheated shed. Most tools are completely unaffected, and it must be common enough that Delta recommends a surface treatment for all their table saws.
我在这种气候下的理想商店将是一个山墙屋顶的结构，并带有大型微风，可用于两个条件区域的侧面工作。我可能会想到用链条围栏或高架门封闭微风，因此不使用时可以固定。
1000+ CFM HRVs do exist, for commercial applications. For example,
http://www.lifebreath.com/products/commercial-hrv/1200-fd-and-1200-dd
or, a more efficient one with an ECM motor, slightly larger
http://www.lifebreath.com/products/commercial-hrv/1500i-ecm
我不知道他们花了多少钱。
Just for background, you can find commercial HRV systems up to at least 4000 CFM, but really big commercial systems are usually ERV, and go up to at least 300,000 CFM! But they use desiccant wheels and might recirculate some of the dust.
马尔科姆：明白了，感谢您提供的信息。我认为生锈来自冷凝水（工具冷却比潮湿的空气），因此，如果显示出来，我需要减少温度秋千（通过绝缘）或减少空气水分（通过除湿）。两种方法都需要一定程度的气密性，不是吗？
再说一次，这取决于相关变量的值，如果您处于同一气候区域，并且在无条件的棚屋中没有工具锈病问题，那么这是一个令人信服的参数=）
无条件空间中的凝结和生锈的最坏情况是一个很酷的夜晚，随后是温暖的潮湿一天。良好的厚钢工具的热量保持冷，而潮湿的空气在白天流入，并在其上沉积冷凝。从马尔科姆（Malcolm）在您所在地区几乎没有问题的报告中，可能这些情况并不像某些地区那样普遍。但是无论如何，绝缘材料将有助于避免该工具在晚上变冷；虽然空气密封将有助于避免白天有尽可能多的潮湿空气进入。
我相信，即使没有冷凝水，未受保护的钢也会在高湿度下生锈，但是我不知道从哪里开始的阈值，而且您可能没有太多完全没有保护的钢。
Smart controls on ventilation can help, by bring in outside air when the absolute outdoor humidity is low and avoiding it when the outdoor absolute humidity is high. There are a few commercial systems that offer that capability.
Charlie, I don't really understand what mechanisms are at work. For twenty years I have kept my tools in an unheated shed without any any visible corrosion (the table saw and bench tools are at the larger shop I share). The cladding on the north side of my shed periodically shows signs of mold, as do the posts on my porch.
Perhaps you are right. It is the sudden swings in temp and humidity that cause the rust - which are different conditions than those creating favourable climate for mold growth.