I added a heat pump to heat/cool my shop (bottom left). The unit is at the back of my shop which is also the back of the garage. A few years ago I built a roof across the back so I could keep my firewood dry. After adding the heat pump my wife was worried that the stacked firewood might fall onto the unit and damage it. It has happened a couple of times caused by cats and storms before we installed the heat pump, so she asked me to make a partition to prevent that happening.
I wanted to make something open that would still allow the air to circulate and I came up with a simple frame with a couple of X’s in it. Luckily I had some leftover 2X4 from my BBQ shed that I ripped in half for the job. I used mortise and tenon joinets on the outside frame. The X’s are held in with long bamboo dowels and glued in the center which are half lap joints that I cut and hand chiseled. The 2X4s were rounded on the edges and so there are seams showing where the X’s meet but I was pleased that I got a good tight fit with the handwork.
Mike, an American living in Norway