Is the machine designed to prevent bypass leakage around the HEPA filter?
Even the best HEPA filter can’t prevent contamination problems if the machine is not designed to prevent contaminated air from bypassing the filter. Look for important contaminated air bypass prevention features such as: • Flat, rigid HEPA sealing frames with no welds or other surface irregularities that can disrupt the seal • Seamless poured closed-cell neoprene gaskets or silicone gel seals as opposed to gaskets with seams or made from open cell foam • Solid rivet fasteners versus weaker and potentially leaky hollow pop-rivets or metal screws.
