Vent winter door installation

 If you have placed your desired amount of insulation into the crawl space vent, you can then insert the winter door/heater plate into the face plate and mount it between the 2 threaded rods.  Once this is completed, you reaffix summer door onto the threaded rods and screw the knurled nuts, finger tight only  Remember to lubricate the threaded rods at least once a year with candle wax, bees wax, or never seize or similar lubricant.