Side Downdraft Booths for Illinois Truck, Trailer and Bus Finishing
Painting a trailer or a bus in a crossdraft booth means one end of the vehicle always sits in the other end's overspray. A side downdraft booth fixes that without a pit: air comes down from a full ceiling plenum and exits through filters low on each side wall. Double D Mechanical installs these booths for Illinois truck, trailer and fleet shops, including the heated air systems they need for Midwest winters.
Discuss your installationTrailer Volume South of Chicago
With Hyundai Translead building trailer plants in Will County, more trailer and truck body finishing is happening in the Chicago region. Repair shops, upfitters and component suppliers that serve that market handle long workpieces where airflow consistency from front to back matters. Side downdraft gives them that on an existing floor.
Duct Runs on Both Sides
Unlike a crossdraft or semi downdraft booth with a single exhaust point, a side downdraft booth collects air along both side walls. Ductwork from each side has to join before the exhaust fan, and the runs must be balanced so one side does not pull harder. We route that ductwork overhead or along the walls in a way that leaves maintenance access and keeps forklift aisles clear.
Cold-Weather Air Supply
A booth large enough for trailers and buses moves a lot of air, all of which has to be heated in winter. Burner capacity, gas supply and controls are a big share of the project.
- Burners sized for long cold stretches, not average winter days
- Gas service confirmed before equipment is ordered
- Cure cycle controls that raise cabin temperature safely
- Energy-saving idle modes interlocked with spray equipment
Planning a booth or oven project in Illinois
Crews mobilize from Houston; Illinois is roughly 950 miles away, so equipment, panels and tooling are staged and shipped ahead of the install crew.
Manufacturing in Illinois is concentrated around Chicago, Peoria, Rockford, and Champaign. The sectors most likely to be specifying spray booths, blast rooms, powder systems and cure ovens there include heavy equipment and machinery, food processing, metal fabrication, and transportation equipment.
Cold winters mean make-up air heaters are sized for sub-freezing intake, and booth or oven placement has to account for frost lines, snow loads on roof penetrations and winter slab work.
Frequently asked questions
Is side downdraft good for buses?
Yes. Long vehicles with large side panels benefit from airflow that moves down along the full length of the vehicle.
How does the exhaust ductwork connect?
Each side wall plenum connects to ductwork that joins before the exhaust fan. The two sides are balanced so they pull evenly.
Does a side downdraft booth need more heat than a crossdraft booth?
It depends on airflow volume, but large vehicle booths move a lot of air, so heating load in winter is substantial.
Can you add a cure cycle to an existing booth?
Sometimes, if the make-up air unit and controls can support it. We evaluate the equipment before recommending changes.
What should be ready for a site visit?
Booth drawings or size, the longest vehicle you paint, a floor plan, roof details and nearby gas and electrical service.