Solar Air Heating – Part 11 – Wall Depth Does Matter

In Part 10, in our continuing series of articles about our attempt to improve the energy conservation in our home through the use of a solar air heaing unit, the holes in the wall were made for both the intake and outflow of the air in to and out from, respectively, the Cansolair Solar Max 240. Now, the ‘blower duct’ is the square metal tube into which the component, called the ‘blower assembly’ which will draw the air from the house / building into the the solar air collector.

The instructions call for the blower ducts to be cut in length so that 1 inch is exposed beyond the gasket on the outside of the wall.

One problem. What if the depth of the wall exceeds the length of the blower duct? Ours did per the picture below.

solar max 240 initial blower duct assembly Solar Air Heating   Part 11   Wall Depth Does Matter

In the above picture, you can see that the end of the blower duct and the black fan part at the end of the blower assembly barely come out of the wall, not nearly sufficient to be contained within the Solar Max 240. Oops. icon sad Solar Air Heating   Part 11   Wall Depth Does Matter

This was caused because in our house we have that wood paneling behind the drywall.

wood panelling exposed Solar Air Heating   Part 11   Wall Depth Does Matter

Both the vertical wood paneling and the horizontal sheathing in behind are adding a couple inches to the total depth between the exterior brick on the outside of the wall and the drywall on the inside.

What to do? First, let’s deal with the blower assembly.

solar max 240 blower assembly Solar Air Heating   Part 11   Wall Depth Does Matter

In the above picture you can see we have disassembled the unit cover. On the ground is the interior cover containing the blue washable filter. Notice the four long silver metal screws holding the component with the black fan (at Bennett’s right hand) at the end of the unit to the wiring housing component (at Bennett’s left hand).  Do you see how each of these long screws protrude about 3 to 4 inches into the part of the blower assembly by Bennett’s left hand?

All we did was to measure how much distance we needed to extend the end of the blower assembly past the bricks on the outside wall so it would be sufficiently contained within the solar air collector. It was about an additional 2 and 1/2 inches that was needed. So, we simply adjusted the original assembly to increase the distance between two components.

solar max 240 blower assembly extended Solar Air Heating   Part 11   Wall Depth Does Matter

Notice in the above picture the significantly decreased length of the 4 metal screws at each corner of the front of the blower assembly.

Now, when the extended blower assembly is placed into the opening in the wall you can see, if you compare to the very first picture in this article, that the blower assembly now sufficiently extends away from the outside wall.

solar max 240 blower duct and assembly Solar Air Heating   Part 11   Wall Depth Does Matter

But what about the blower duct? There is too much space between the end of the blower duct and the extended blower assembly.

Return tomorrow to see how we extended the blower duct.

To continue to the next article in this series, simply select this link to Part 12 – Extending the Blower Duct.

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