Comments on: Supply and Exhaust Ventilation in a Surprising Place

By: Shae

Shae — Mon, 15 May 2023 14:43:27 +0000

Wow…. So how accurate is a uHoo air quality monitor? Right now I’m sitting at around 1800ppm with 2 windows open about 1/2″ each.

I’m thinking I need a ventilating dehumidifier and run my own duct for it. HVAC is in the attic and I don’t even like that but I have no choice right now.

By: Bob Blanchette

Bob Blanchette — Tue, 02 May 2023 11:32:14 +0000

In reply to Dale Dellario. Commercial filters are typically MERV 8 for cost reasons. Keep in mind facilities are often buying multiple boxes of them at a time. MERV 11 or higher is a special order. The bigger issue is making sure they are changed regularly, not just when they are so bad it causes equipment failure.

By: Dale Dellario

Dale Dellario — Sun, 30 Apr 2023 20:44:09 +0000

I wonder how common it is for hotel ventilation to be filtered. For homes, I found that inline MERV15 filter assemblies with low pressure loss (~.02 in w.g.) are relatively inexpensive. I plan to install one in the intake line of my HRV system. My system is between 150 and 200 cfm for the house which is 3000 square feet. That would be about 15 rooms in a hotel. The relatively new Hyatt Regency in Seattle has nearly 1,500 rooms on 45 floors so would need at least 100x the filter area we would. Looking into this a bit, it seems that most hotels do not filter the air as a matter of course as evidenced by ones that are starting to do it on a room-by-room basis. In my former start up focused on lighting that supports circadian rhythm, we found that capital improvement money is hard to find for what are viewed as amenities whose competition is doing nothing. You mention monitoring CO2, Allison. It would be interesting to check indoor air quality.

By: MT

MT — Thu, 27 Apr 2023 08:29:56 +0000

Cold blasts are why I always install a toe tester in a shower. That and having somewhere to fill a bucket. Not keen on open showers because of the cold drafts and I certainly don't want to be out of the spray when adjusting the temperature. Nice that they have balanced air.

By: Allison Bailes

Allison Bailes — Wed, 26 Apr 2023 13:36:13 +0000

In reply to RoyC. Roy: Yeah, I guess I didn't do a good transition there. I was just adding a bit about the secondary issue.

By: RoyC

RoyC — Wed, 26 Apr 2023 13:23:31 +0000

In reply to Allison Bailes. My comment was not about liquid water spraying out of the shower when there is no door. I am talking about the big natural convection currents that occur between the shower stall and the rest of the bathroom that causes the humidity to rise much faster in the rest of the bathroom and the shower stall being cooler when there is no door. A door greatly reduces that convection even if it doesn't go all of the way to the ceiling.

By: Greg

Greg — Wed, 26 Apr 2023 12:33:17 +0000

According to graph you have a sleep apnea 😛

By: Allison Bailes

Allison Bailes — Tue, 25 Apr 2023 20:58:40 +0000

In reply to John Mattson. John: Why the permanent installation? Is your fan so quiet that you're going to use that as a visual indicator of fan operation?

By: Allison Bailes

Allison Bailes — Tue, 25 Apr 2023 20:55:48 +0000

In reply to RoyC. RoyC: Yeah, that seems to be a trend in some hotels these days. Fortunately, it was big enough that not much water splashed out.

By: Allison Bailes

Allison Bailes — Tue, 25 Apr 2023 20:54:24 +0000

In reply to Paul Szymkiewicz. Paul: I was dreaming about skiing down a beautiful slope that doesn't exist. It's the most magical ski slope in the world, and I visit it as often as I can. That's the up-and-downness you're seeing in the graph.