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4 Filter Build – A Corsi/Rosenthal Box also called the Compretto Cube. Top is a fan, but the bottom is just cardboard – no bottom filter.

    There are several different builds below. No matter which one you choose make sure you put a shroud on the front of the fan to enhance efficiency. Here is a 4 filter build known as the Compretto Cube: hosted by… Read More »4 Filter Build – A Corsi/Rosenthal Box also called the Compretto Cube. Top is a fan, but the bottom is just cardboard – no bottom filter.

    Type of Fan

      The Corsi/Rosenthal Box is based on a 20″ x 20″ box fan.  This is because the size perfectly matches with 20″x20″ filters. Some countries have no box fans. Round fans have been used to build the Corsi/Rosenthal Box. 20″ Box… Read More »Type of Fan

      Type of Tape

        Any type of duct tape is recommended. Keep in mind that you can use the duct tape color to accessorize your DIY Air Cleaner. Please see the Gallery for lots of creative fun ideas.

        Type of Filters

          20″x20″x1″ or 20″x20″x2″ MERV 13 filters are recommended. MERV 13-A filters are available here.  Why 13-A? Because they are top of the line. If MERV 13-A filters are not available, the next filters recommended are MERV 13 filters from 3M . … Read More »Type of Filters

          Read Me First

            Before reading any farther, even with 2 or 3 portable air cleaners in your space, everyone must wear a mask (more on masks, kids’ masks and reusable elastomeric respirators). Like getting closer to a cigarette smoker, respiratory aerosols get thicker… Read More »Read Me First

            oldRead Me First

              Before reading any farther, even with 2 or 3 portable air cleaners in your space, everyone must wear a mask (more on masks, kids’ masks and reusable elastomeric respirators). Like getting closer to a cigarette smoker, respiratory aerosols get thicker… Read More »oldRead Me First

              oldType of Filters

                20″x20″x1″ or 20″x20″x2″ MERV 13 filters are recommended. MERV 13-A filters are available here.  Why 13-A? Because they are top of the line. If MERV 13-A filters are not available, the next filters recommended are MERV 13 filters from 3M . … Read More »oldType of Filters

                oldType of Tape

                  Any type of duct tape is recommended. Keep in mind that you can use the duct tape color to accessorize your DIY Air Cleaner. Please see the Gallery for lots of creative fun ideas.