Talk:Blower door

message: I deleted the cross reference to VerdaTech. The VerdaTech article neither adds much to the topic of Blower Doors, nor does it seem balanced with only one company listed. VerdaTech is one of a huge number of companies who perform blower door tests in the course of doing business, and shouldn't be featured specially without a compelling reason.  —Preceding unsigned comment added by 24.85.224.202 (talk) 14:33, 9 October 2007 (UTC)
thread_title: Untitled

message: This info is all good stuff but I would like (possibly a new linked article) to see mention of figures for conventional "draughty" old housing stock, targets for new housing in various countries and the values achieved for high end "passive houses". Likewise a discussion on draughty versus stagnant/stuffy houses with associated figures and remedies ie that is there can be a negative impact to reducing airflow in a dwelling. I have seen it suggested that 0.5 ACHnat or 10 ACH50 is a "good balance". I note that the conversion from ACHnat to ACT50 actually uses an empirical conversion figure of "20". The fact this is empirical is not stated. I have seen - sorry no refs - values of 25 used, based on average wind speed figures in a particular location. ie local weather is a factor. That needs to be made clear. I would also like to see discussion of the main causes of poor figures (having identified what poor is). As I understand the hierarchy in dwellings is windows, doors, ventilators and cracks around skirting boards. I have no expertise in this area but I want to learn from those that do - especially when it comes to building new homes.  — Preceding unsigned comment added by 124.191.112.66 (talk) 09:38, 5 October 2012 (UTC)
thread_title: Blower door test targets

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thread_title:  External links modified 

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thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: I would like to propose the addition of the following information regarding the development of blower door technology in both Sweden and Canada. While this may be a slightly controversial departure from the standard historical narrative that attributes the development of the blower door solely to Sweden in 1977, I believe it's important to acknowledge earlier work in Canada.
**Introduction:**
Blower door technology was independently developed in both Sweden and Canada. These were the days before the internet and before desktop computers and word processors, so the transfer of information even within a single organization could become compartmentalized.
The initial concept involved the use of a "blower window," which was first utilized by G.T. Tamura in Ottawa, Canada, as part of the NRC/DBR to test houses in 1967-68 and published in 1975. In Sweden, the earliest implementation of blower door technology used a fan mounted in a window around 1977[4]. Similar window-mounted measurement techniques were being pursued by Caffey in Texas in 1979[5], and door-mounted test fans were being developed by Harrje, Blomsterberg, and Persily at Princeton University to help them find and fix air leaks in homes in a Twin Rivers, New Jersey housing development.
In Canada, a team at the National Research Council of Canada's Division of Building Research (NRC/DBR) in Saskatchewan, building off the published work of Tamura in 1975, including Harold Orr, advanced the concept into the blower door used in the construction of the Saskatchewan Conservation House in 1977, employing similar testing methods. The Saskatchewan group, which included Harold Orr, was actively involved in the development of the blower door in 1977-78 and published their findings in 1980. They made available their flow nozzle to interested companies. Harold Orr, who had been in Ottawa in 1967 when Tamura was conducting his work, continued to work on blower door technology after Tamura published his paper. Their work, based on Tamura's blower window concept from 1975, preceded the Swedish work in 1977 by a decade[9]. The blower door was further used to test the airtightness of the Saskatchewan Conservation House built in 1977, which was tested at 0.8 l/s at 50Pa[10].
**References:**
- Orr, H. W., & Figley, D. A. (1980). An exhaust fan apparatus for assessing the air leakage characteristics of houses. National Research Council of Canada. Building Research Note, no. BRN-156.
- Tamura, G. T. (1975). Measurement of air leakage characteristics of house enclosures. ASHRAE Transactions, 81(1), 202–211. Presented at the 1975 ASHRAE Semiannual Meeting, Atlantic City, NJ, USA, Jan 26-30, 1975.  — Preceding unsigned comment added by Saskaboom (talk • contribs) 15:52, 9 October 2023 (UTC)
thread_title:  '''Edit History'''  ( Oct 09, 2023)