Just curious, are those fans sucking or blowing or is 1 sucking and 1 blowing? Have you noticed any heat up issues?
One fan pulls air into the canopy while the other blows it out. Also, if you look closely at the pictures you will notice that I also spaced the boards on top of the canopy about 3/4" apart. This will allow natural convection to take place and remove the heat from the unit and bring in cool air from the bottom.
I have absolutely ZERO issues with heat with this design. There is hardly any heat escaping from the top (I can only conclude the fans are drawing the majority out). Water temperature is also unaffected.
I love it when a plan comes together.