Protecting HVAC Intakes From Sand: Louver, Filter and Upkeep

Protecting an HVAC air intake from sand takes more than one component. A sand trap louver at the opening stops coarse sand and grit, filters downstream handle fine dust and particulates, and regular checks keep both doing their job. Goodwind makes the sand trap louver (model GT-STL) along with access doors and other duct accessories that sit around it.

Three Layers of Intake Protection

Layer	What it handles	Where it sits
Sand trap louver	Coarse sand and grit carried by wind	Exterior wall intake or exhaust opening
Filtration	Fine dust and particulates the louver does not stop	Downstream, in the air handling path
Access and upkeep	Keeping the louver sill, filters and ducts clear	Access doors beside filter banks and dampers

What the Louver Does and Doesn't Do

The louver's vertical blades make the airstream turn. Sand carries more inertia than air, so it keeps going straighter and lands on the sloped sill, which is angled so the sand drains or blows back out. That reduces how much bulk sand the filtration has to deal with. It is not a substitute for an air filter: fine dust and particulates still pass through and need to be filtered the way they would on any HVAC intake. Our sand trap louver guide explains the mechanism, and the glossary definitions of particulates and air cleaning cover the terms.

Keeping the System Working

Check the Louver Sill

The sill is angled so collected sand drains or blows back out, but it is worth checking for build-up, especially after heavy sand events, and clearing it if sand has accumulated.

Watch the Filters

A filter that loads faster than expected is worth investigating, since it can mean more coarse material is reaching it than the louver was expected to stop. Set inspection intervals from how sandy the site actually is rather than from a fixed calendar.

Plan Access Early

Access doors beside filter banks, dampers and coil sections make this upkeep possible without cutting into finished ductwork. Our ductwork accessories guide covers access doors and the other fittings.

Specifying Layered Protection

For MEP Consultants at the Design Stage

Specify the Filtration for What the Louver Won't Stop

Treat the louver as the first stage. Select the downstream filters for the fine dust and particulates that get past it, and state the site's sand exposure in the specification. See how to specify a sand trap louver for what to put on the schedule.

Show Access Points on the Drawings

Mark access doors at filter banks and dampers on the drawings so they are built in from the start and not added later.

For Contractors at Procurement Stage

Confirm the Louver Matches the Duct Connection Behind It

Louvers are manufactured to size, so check the louver's opening dimensions against the duct or plenum behind it before ordering, and submit the exact dimensions.

Confirm Type, Material and Finish Before Ordering

Several louver types look alike once installed but are not interchangeable. Check the sand trap type, material and finish against the drawing. Our sand trap vs weather louver comparison shows how they differ.

FAQ

How do you protect an HVAC air intake from sand?

Use a sand trap louver at the opening to stop coarse sand and grit, filtration downstream for fine dust, and regular checks of the louver sill and the filters.

Does a sand trap louver replace an air filter?

No. It reduces the amount of coarse sand reaching the filters, but fine dust still needs to be filtered downstream.

How often should a sand trap louver be checked?

There is no single interval. It depends on how sandy the site is, so check the sill after heavy sand events and set the routine from what you find.

Where should access doors go?

Beside filter banks, dampers and coil sections, so they can be reached after the ceiling and ductwork are finished.

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Protecting an intake on a sandy site? Contact Goodwind with your opening size and airflow, or read our guide to sand trap louvers for desert and coastal projects.