<html><head></head><body><div>Hi All, </div><div>Back to work on Gamma mods. I bought two hydroponic carbon air filters-the type people are converting to CO2 scrubbers. I also bought a bilge fan and speed controller. The idea is to use both filters in series, but one filter will be converted to a scrubber. The bilge fan will draw air through the scrubber and discharge through the carbon filter. The speed controller will allow me to find the sweet spot for max efficiency. I am not sure if this is a great idea or if it is needed, but I am going to give it a try and see how it works. </div><div>Hank</div><div class="ydp811ec18byahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"></div></body></html>