Semi Downdraft Booths for Georgia Shops That Can't Dig a Pit
A semi downdraft booth brings air in through a ceiling plenum over the front portion of the cabin and exhausts it through a filter bank in the rear wall. The air travels down and back across the part, which gives a cleaner result than crossdraft without cutting a pit into the floor. For Georgia shops in leased buildings or on slabs that cannot be disturbed, that trade is often the right one. Double D Mechanical installs, moves and services these booths around Atlanta, Savannah and the rest of the state.
Discuss your installationWhy the Slab Often Decides It
A full downdraft booth needs a pit or a raised basement. A semi downdraft booth sits on the existing floor. For shops that lease, run in-floor utilities they cannot relocate, or have a slab too thin to cut safely, that is the deciding factor. The finish quality sits between crossdraft and full downdraft, which suits fleet, truck and general fabrication work.
Coastal Georgia Fabrication Activity
New plants like the Virginia Transformer facility in Rincon bring transformer and enclosure work to the Savannah area, along with the supplier fabricators and coating shops that grow around a large plant. Many of those smaller shops start with a single booth and want to avoid concrete work. A semi downdraft booth gives them a cleaner finish than open-face or crossdraft without a pit.
What Goes Into the Install
The cabin is only part of the work. Mechanically, the booth needs a supply path into the ceiling plenum and an exhaust path out of the rear filter chamber, with both sides sized to match.
- Make-up air unit on the roof or on a pad beside the building
- Supply duct to the front ceiling plenum
- Rear exhaust chamber, fan and stack through the roof or wall
- Gas piping to the burner, electrical for fans, lights and controls
- Interlocks between spray equipment, fans and fire protection
Keeping It Running
The rear exhaust filters load faster near the paint position, and that loading changes airflow through the cabin. Watching the pressure gauge and changing filters on a schedule keeps the airflow pattern working. We service fans, burners, controls and door seals on semi downdraft booths, and rebalance when a shop changes coatings or throughput.
Planning a booth or oven project in Georgia
Crews mobilize from Houston; Georgia is roughly 700 miles away, so equipment, panels and tooling are staged and shipped ahead of the install crew.
Manufacturing in Georgia is concentrated around Atlanta, Savannah, Augusta, and Columbus. The sectors most likely to be specifying spray booths, blast rooms, powder systems and cure ovens there include automotive assembly and EV, aerospace, transportation equipment, and heavy machinery.
Hot, humid summers and mild winters put the emphasis on make-up air cooling or tempering, filter change schedules and keeping intake away from loading doors.
Frequently asked questions
Is semi downdraft as clean as full downdraft?
Not quite. Air still travels toward the rear wall, so some overspray passes along the part. It is a meaningful step up from crossdraft without the floor work of full downdraft.
Can a semi downdraft booth go in a leased building?
Usually, since it does not need a pit. Roof or wall penetrations for exhaust and make-up air still need the landlord's approval.
What size vehicles fit in a semi downdraft booth?
They come in sizes from cars to trucks and equipment. The cabin is chosen around your largest workpiece plus walking room around it.
Do you relocate semi downdraft booths?
Yes. Because there is no pit, relocation is mostly disassembly, transport coordination, reassembly and new utility and duct connections.
How often should rear exhaust filters change?
It depends on paint volume and coating type. The cabin pressure gauge is the best guide, and a schedule built from your actual use works better than a fixed date.