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 general exhaust 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 $22.90
SV28-23 Primex soffit vent. No duct adapter. With screen and backdraft damper. TAUPE color. 1 Day. In-stock $22.90
SV28-25 Primex soffit vent. No duct adapter. With screen and backdraft damper. BLACK color. 1 Day. In-stock $22.90
SV28-28 Primex soffit vent. No duct adapter. With screen and backdraft damper. DARK GREY color. 1 Day. In-stock $22.90
SV28-31 Primex soffit vent. No duct adapter. With screen and backdraft damper. LIGHT GREY color. 1 Day. In-stock $22.90
RV28-456 Primex universal duct adapter for 4/5/6 inch duct. Fits multiple duct sizes. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $9.20
RV28-4 Primex duct adapter for 4 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $9.20
RV28-5 Primex duct adapter for 5 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $9.30
RV28-6 Primex duct adapter for 6 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $9.30
RV28-7 Primex duct adapter for 7 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $9.80
RV28-8 Primex duct adapter for 8 inch duct. Use with RV28, SV28, RVL28 caps. 1 Day. In-stock $10.20
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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:   Has this been approved to use in impact zones such as Florida? If not, are there any indications of the MPH that the vent can handle without ripping out of the Hardie/Zip panel soffit I plan on screwing this in to?
A:   These products have not been tested or approved for any Dade County or Florida ratings.

       Asked on 2024-01-24 by RM
#2 Q:   Can this be used on a clothes dryer vent installation?
A:   Best to use the SV4 as it is smaller with no screen, but with screen removed, this will work fine.

       Asked on 2023-10-28 by Judy B
#3 Q:   So this if for exhaust and intake. Do I just remove the damper for intake?
A:   That is exactly how it is used for intake. The damper is removable.

       Asked on 2023-05-10 by Simon
#4 Q:   Is this compatible with a range hood with 1200 CFM? Will have 8 inch duct.
A:   Its compatible with typical 8 inch duct airflows which are 500 to 850 cfm. You will have a large pressure drop trying to push 1200 cfm through and 8 inch duct and 8 inch cap.

       Asked on 2021-07-04 by Ashley
#5 Q:   How much heat can these withstand? I am looking to vent a hood for an outdoor kitchen (Propane grill) through the soffit to avoid putting holes in the patio roof.
A:   There is no official rating from the manufacturer but they are designed to vent typical HVAC exhaust air streams. Normally up to 140 F.

       Asked on 2021-06-23 by Don
#6 Q:   looking for SV28 without the screen (SV28NS) to utilize for a dryer vent. It does not appear you carry this model. Is the screen that comes on the SV28 removable?
A:   We do not carry the SV28NS version. Sorry. The screen is not removable.

       Asked on 2021-02-02 by RM
#7 Q:   1.What is the length of the snap in adapter?2. Can this vent works with 70 cfm air flow pressure of bathroom exhaust fan?
A:   The adapter is 4 inches long. That vent should be fine with that cfm and opens easily.

       Asked on 2020-11-22 by V P
#8 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
#9 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
#10 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
#11 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
#12 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
#13 Q:   Can I cut the flange down?
A:   Yes, you can trim the flange as needed.

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

       Asked on 2018-03-10 by Larry
#15 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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