Primex SV28 Series Soffit Intake and Exhaust Vents

The Primex Soffit Intake and Exhaust Vent (SV28) is ideal for 4-8 inch ducts that require venting with a damper. This versatile unit allows for the termination of kitchen, bath and dryer vents. The SV28 is designed to prevent pests, birds and rodents from entering the home. 


• Low profile, one-piece molded hood eliminates leaky joints and provides maximum water protection.
• Vents odor and moisture away from the home.
• Optional screen and removable damper.
• Available for intake or exhaust applications.
• Snap-in adapters (SOLD SEPARATELY) ensure a tight seal.
• Made with UV-protected Polymer resin.
• Available in Snow White and Taupe

model description usually ships price QTY
SV28-01 Primex soffit vent. No duct adapter. With screen and backdraft damper. WHITE color. 1 Day. In-stock $17.70
SV28-23 Primex soffit vent. No duct adapter. With screen and backdraft damper. TAUPE color. 1 Day. In-stock $17.70
RV28-4 Primex duct adapter for 4 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $7.10
RV28-5 Primex duct adapter for 5 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $7.20
RV28-6 Primex duct adapter for 6 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $7.20
RV28-7 Primex duct adapter for 7 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $7.60
RV28-8 Primex duct adapter for 8 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $7.80
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Primex SV29 soffit vent dimensions

Do you have questions about the products on this page?

Click on the ? image on the left or this link to ask us your questions!
#1 Q:   I have an older home and the exhaust pipe is 3 diameter metal. Do you have a 3 to 4 adapter that will allow me to use the SV28 Soffit Exhaust Vent?
A:   We do not. Sorry. That is no longer a common size.

       Asked on 2020-06-03 by WB
#2 Q:   Is this supposed to be screwed into the bottom of the soffit where the flaneIs visible? Or can we install inside the soffit, cut a square the. Drop the vent through the hole?The large flange is a bit unsightly, if installed on the outside of the soffit we can trim away. Also, the unit says do not install beyond soffit, can you guys elaborate or post a photo of one of these installed?
A:   It can be installed inside the soffit. Have a look at the picture here:

       Asked on 2020-02-11 by Joey
#3 Q:   Can this handle 400 cfm air flow for an exhaust fan?
A:   Yes. That is within the allowed CFM for these.

       Asked on 2019-12-31 by Matt
#4 Q:   I bought the SV28-01 with the RV28-4 adapter. I dont think it will come in time for my contractor to install it for me. I would have to have him drill the hole at least so that once it comes in, I can just insert it. I cant find the instructions for what size hole to drill in the soffit. Can you point me to something? Also, is the adapter I bought meant for soffit instillation or something else?
A:   The RV28-4 converts the square opening to round for a duct connection. I would show your contractor the spec sheet which has the base dimension. They should be able to figure it out based on that.

       Asked on 2019-09-02 by Eddie
#5 Q:   My soffit has a 5.5 / 12 pitch. Would the door be in closed position in the normal fan off situation?
A:   No. This soffit vent is meant for horizontal installation. If you install on a pitched soffit, the door would not close properly.

       Asked on 2019-08-12 by Tony
#6 Q:   Can I cut the flange down?
A:   Yes, you can trim the flange as needed.

       Asked on 2019-05-26 by Pete
#7 Q:   Is this vent paintable?
A:   Yes it is a paintable plastic.

       Asked on 2018-03-10 by Larry
#8 Q:   Im looking for the snap in adapters (sold separately) for the sv28-01 soffit vent in 8 in duct.
A:   Same page, couple of lines below the SV28-01. Part number RV28-# where # is the duct connection size.

       Asked on 2017-04-19 by Christopher

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