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TJW4312 Second Stage TopJet Wall Air Inlet

PATENT NO. 6,475,078

Part 90519CH
Framed Opening: 43.75″ x 12.5″
CFM 2,408 @ 0.125 SP
Bess Labs Test #05291

  • Translucent louver blades allow more natural light into animal room
  • Adjustable counterweight for balancing multiple inlets, with ability to adjust for higher / lower static pressure
  • TJW louvers open from top instead of bottom and are designed to direct airflow towards the ceiling area
  • Engineered to open at 0.05 to 0.07 static pressure

The new TJW Trim Insert will help improve the seal of the inlet in the hog barn, assist in ease of caulking, and give the TJW Gravity Inlet a clean, finished appearance. Designed to fit the TJW4312 TopJet Gravity Wall Air Inlets.


Due to a number of problems, the BIL Inlet have been replaced with a Double L TJW Wall Inlet. Some of the problems with the BILs included leaked air around the blade into the room and the linkage system was / is very hard to adjust compared to the TJWs. The TJWs are counterweighted on each translucent blade, allowing air to be brought in along the ceiling to mix the warmer air at that height with the cooler air near the floor. This helps with LP gas costs and helps reduce pig scours by reducing the chance pigs get chilled. Each of the louvers are easier to keep clean and don’t break like the BIL blades do. Airflow capacity can also be increased with the TJW Inlets.

Installation-of-TJW-Gravity-Wall-Inlets-in-Hog-BuildingInstalling TJW Wall Inlet

How-To-Install-TJW-Wall-InletReplacing BIL Inlets

BIL-Inlet-in-Hog-BuildingBIL Inlet in Hog Building