The Honeywell adapters come in a three pack:  two for inhale and one for exhale. Simply pull and stretch to remove the OmniMask E100 filter housings and replace them with the Honeywell adapters. Make sure when doing so that the exhale housing is located at the chin and the two inhale housings at the cheekbones.This specific orientation is very important:  it brings air across the capillaries in the checks to help keep your skin cool and dry and also helps remove hot and humid exhaled air to help keep your mask fog free.You can ensure you have the inhale and exhale housings in the right orientation by looking at the blue valves mounted in the filter housings:  the valves on the cheeks should be oriented towards the wearer to be in inhale mode and the valve at the chin should be oriented away from the wearer to be in exhale mode.For cleaning purposes, the valves are removable, so after cleaning be sure to double check their orientation before wearing your OmniMask.