Every fabricator eventually hits the same wall. The parts get bigger, the blast cabinet doesn’t, and someone ends up open-blasting in the yard with a tarp, a pressure pot, and a lot of sand on the ground. If you spent FABTECH asking “how do we clean really big parts?”, this is the answer: once a part is measured in feet instead of inches, you stop looking at cabinets and start looking at a walk-in abrasive blast room.
The cabinet-to-room threshold
The largest standard production cabinets we sell, the PowerBlast and CleanBlast, top out at a 72″ x 72″ interior with a 36″ x 30″ door opening and a 500 lb work surface. That covers brackets, housings, wheels, small weldments, and anything one person can lift through a door. It does not cover:
- Welded frames and skids
- Structural steel: beams, columns, plate
- Tanks, cylinders, and pressure vessels
- Trailers, truck bodies, and vehicle frames
- Pipe spools and pipeline sections
- Castings and forgings over a few hundred pounds
For all of those, the operator has to walk around the part rather than reach into a glove port. That is the definition of a blast room.
What a blast room actually is
A blast room is not a shed with a blast pot inside. It is a system with six parts that have to be sized together: a modular steel enclosure, a media recovery floor, a dust collector, pressure blasting equipment, operator safety and breathing air, and controls and lighting. Get the enclosure right and the floor wrong, and your operators spend an hour a day shoveling abrasive instead of blasting. Get the dust collector wrong and they can’t see the part they’re working on.
Step 1: size the room to the largest part, plus working space
Start with the biggest part you’ll blast in the next five years, not the biggest part you blast today. Add room for the operator to stand back far enough to hold a proper blast angle on every face, typically 4 to 6 feet on each side, and height for the hose and lighting. Kresco rooms are built from bolt-together 14-gauge galvanized steel panels (10-gauge optional) in pre-engineered sizes or fully custom dimensions, so the room is engineered around your part list rather than forcing your parts into a catalog size.
Step 2: decide how parts get in and out
This decides the door package. Forklift and cart loads use a standard single or bifold door. Trailers, truck bodies and structural steel usually call for a drive-through room with roll-up or bifold doors on both ends. Hanging parts use an overhead monorail that runs through the room. If you’re not sure, tell us how the part moves through the rest of your shop and we’ll match the doors to it.
Step 3: choose the media recovery floor
This is the biggest decision in the room, and the one that drives the budget. Three families:
- Pneumatic recovery (PARS2000): vacuum-based floor sections that pull media back to the pot. Recovers up to 2,000 lb/hr, installs above-slab or in a shallow trench, and works for most recyclable media except heavy steel grit and large shot.
- Mechanical recovery (MARS2000): excavated screw conveyors feed a bucket elevator and airwash separator. Handles any media, including steel grit, at up to 10,000 lb/hr and supplies up to four blasters at once. This is the production-shop floor.
- Hybrid (HARS2000): an excavated auger with vacuum transfer, for buildings where a full pit or the ~20 ft ceiling a bucket elevator needs isn’t available.
Six standard floor layouts run from a single pit up to full-floor coverage that eliminates sweeping entirely. We cover the trade-offs in detail in Blast Room Media Recovery Systems Explained.
Step 4: size the dust collector for the room, not the pot
Visibility inside a blast room comes from airflow. A reverse-pulse cartridge dust collector sized to the room volume keeps air moving past the operator and filters exhaust to 99.9% at 5 microns. Undersize it and the room fogs out within minutes of starting the nozzle.
Step 5: protect the operator
A walk-in room means the operator is inside the dust cloud. Supplied-air respiratory protection with Grade-D breathing air monitoring, door safety switches, emergency stops, and in-room remote controls so nobody has to leave the booth or pull PPE to adjust the pot. We supply GVS/RPB Nova 3 helmets and breathing-air systems on the same purchase order as the room.
After the blast: the part is bare steel
Freshly blasted steel starts flash-rusting within hours in a humid shop. If the part isn’t going straight to the paint booth, protect it with a Cortec VpCI rust preventative or VCI packaging until it’s coated. We quote corrosion protection alongside every blast room for exactly this reason.
Getting a blast room quoted
Send us three things: your largest part dimensions and weight, how parts move through your shop, and roughly how many hours a week you’ll blast. We’ll come back with a recommended room size, door package, recovery floor, dust collector and budgetary pricing. Kresco has over 1,000 blast rooms installed across North America, and every one started with that conversation. Request a quote or a free process evaluation, or start with the Abrasive Blast Rooms Buyer’s Guide.
Coming up in this series: how to blast trailers, structural steel, large cylinders and tanks, vehicles and heavy equipment, and pipe, plus how to automate blasting inside the room and how mechanical media reclaim works.
