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Hi, I would like to add an exhaust fan in my small half bathroom on the first floor (it’s a 2 floor semi-attached home). The bathroom becomes very humid and takes a few minutes to eliminate odors. I’m planning to hire an electrician to install the fan with a switch button. Based on the picture, can you please advise if I can add a fan directly to this exhaust/air duct vent or if I’m required to have an insulation tube leading outside the roof. The house is a flat roof and I don’t have an access point to the attic (or area between my celing and roof). Also, my electrician has sent a few fan suggestions but they are not appealing as they look like attic or laundromat fans. Does anyone have an exhaust fan suggestion that can fit into this vent and appealing (preferably white colored)? The measurements of the vent are 14 inches by height and 13 inches by width. Thank you so much for your support.

Here are some photos of the vent behind the grill:

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  • I should have also noted that I have just purchased this home and I am a first time home buyer, so I’m not sure sure how this vent was previously built or set up.
    – Nis
    Aug 10, 2019 at 3:38
  • Does this house have central HVAC? What is that lower opening in the wall? Aug 10, 2019 at 12:08
  • Where is this property located? Aug 10, 2019 at 12:23
  • This house doesn’t have central HVAC. The bottom opening is a window with privacy glass leading to the kitchen (not sure why it was installed there as it seems useless).
    – Nis
    Aug 11, 2019 at 4:36

1 Answer 1


You need to remove that grill and find out what's behind . Hopefully, there will be some sort of duct work that vents to the outside. You do not want to vent humid air into plain wall space. There are many fans to choose from so look around. I would tend to look more on efficiency than appealing. You can always spray paint it white.

Here is a typical bathroom exhaust fan that has a 13.5" by 13.5" grill and 14.25" x 14.25" housing. It vents to the back. enter image description here

here is a link to the site so you can get more info.


you should also try to clean out as much of the debris from the duck as possible. It will help with the air flow.

  • Thank you Jack for getting back to me. I’ll check out what’s behind the vent. Do you have any example of what type of fans can be installed here? My electrician had recommended a shutter fan but it just doesn’t seem to fit in a bathroom to me. Thanks again.
    – Nis
    Aug 11, 2019 at 4:33
  • I have finally had a chance to remove the cover and it appears to be a vent behind it that goes upward (assuming the roof). Can you please review the photos I have attached and advise if I can install the suggested fan directly into it or do I need to attach a hose leading through the vent? Also, can you please share the link the fan you have previously suggested as I’m unable to find it online. Thank you.
    – Nis
    Aug 20, 2019 at 16:40
  • I edited my answer to include a better fan that vents straight back. Also included a link for the fan.
    – JACK
    Aug 20, 2019 at 17:54
  • Thanks Jack for sharing the link and new fan. I would prefer one that is operated via a switch rather than a pull. It will be great if you can help me find one. For my own awareness, can you please clarify if I have sufficient duct work for a fan, or do I still need to add a flexible foil duct/hose that are typically connected to an exhaust fan?
    – Nis
    Aug 20, 2019 at 20:19
  • Your electrician will have no problem bypassing the pull chain for a switch. This fan is for 10.375" diameter duct, your sheet metal duct is approximately 14"x14" so it will be fine.
    – JACK
    Aug 20, 2019 at 20:38

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