ive been fighting keeping my AMNPS lit since I got it. I have an mes30. If I positioned a fan at the chip loader with it removed, my AMNPS would stay lit, but I'd only get about 3 hours out of it. Frustrating. So, I thought I'd try the mailbox mod. Then I realized that I also wanted to build in a kitchen around my built in broilmaster natural gas pedestal grill. So, I got to thinking about concrete blocks and counter tops and had an idea. What you are seeing below is my temporary concrete block mod that will become permanent after I buy some mortar and stucco and have time. In the meantime, the temporary solution works great. I'm on 4 hours and only through one row of the AMNPS so I know I'm good to go! First level of blocks: Four 8x8x16 concrete "cinder" blocks, one 8x8x8. Next level: Two 8x8x16 and three 8x8x8. Note the one on the right turned on its side, it will become important later. Next level. Two 8x8x16, one turned on side. One 8x8x8, and four 8x4x16 solid blocks. The solid is important. Here's a view from inside the "mailbox" See how the solid blocks and turned blocks keep a smooth surface. The one sideways 8x8x8 makes the exhaust port. For temporary measure, I used some styrofoam sheets and duct tape to rig the door and secure the 3" ductwork. The door is very loosely closed to keep airflow. Thin blue smoke: After I get the mortar and stucco, I'm going to add one of these 8x8 doors from Amazon to finish the job. I may have to drill a hole for airflow, but should be easy. 8"X 8" B-series Access Panel with Cam Lock for walls and ceilings I'll post if I every actually finish it. For now it works very well.