Makes no difference. There is so little air moved it won't make a damned
bit of difference in the operation. I once asked a senior design engineer
that worked for one of the major AC manufacturers about it. He said it is
there because it is a "feature", not because it does anything.
If it works, by all means, use it. We made a tooling modification on a fan
scroll plate for a fresh air vent. It was 1/2" by 1 1/2". Not much air was
going to get in, but this model was going to be sold by Sears and they
wanted it. Main reason was to be able to put a check in the box when
comparing to other brands.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.