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Within the BSRIA Application Guide, Section 4.2 explains the design procedure and Section 5.2 gives worked examples for buildings with a range of air tightness specifications. BSRIA Application Guide 2/97. Air Curtains - Commercial Applications. Air curtains consume electrical energy during their operation, but can be used for net energy savings by reducing the heat transfer (via mass transfer when air mixes across the threshold) between two spaces. However, they should not be seen as an alternative to an air curtain, which also functions to separate the indoor and outdoor air spaces. For commercial applications like store entrances, user comfort dictates lower face velocities, which reduce effectiveness of separation of exterior air from interior air. However, all common antifreeze additives also have lower heat capacities than water, and do reduce water's ability to act as a coolant when added to it. The most common implementation is a downward-facing blower fan mounted over an entrance to a building, or over an opening between two spaces conditioned at different temperatures. Common antifreezes also increase the boiling point of the liquid, allowing higher coolant temperature. Negative pressures, extreme temperature differences, elevators in close proximity, or extreme humidity can reduce the effectiveness of air doors.

Further applications include customer entryways, airplane hangars, cargo doors, drive through windows, restaurant doors, or shipping receiving doors. Structural insulated panels (SIPs), also called stressed-skin walls, use the same concept as in foam-core external doors, but extend the concept to the entire house. Following the COVID-19 pandemic, groups have been researching the use of air curtains for preventing the spread of viruses in enclosed areas such as hospital wards. Air curtains have been used in hospital operating rooms to protect patients from virus-contaminated air. Non-heated air curtains are often used in conjunction with cold storage and refrigerated rooms. Such devices aim to use air curtains to protect healthcare workers from airborne viruses such as coronaviruses. Taken from H.Giraldez, Improved Semianalitycal method for air curtains prediction. ASTM Standard C-1149 - Industry standard for self-supported spray-applied cellulose insulation for exposed or wall cavity application - covers density, R-value, surface burning, adhesive strength, smoldering combustion, fungi resistance, corrosion, moisture vapor absorption, odor, flame resistance permanency (no test exists for this characteristic), substrate deflection (for exposed application products), and air erosion (for exposed application products).

Can serve as a semi-permeable vapor barrier with a better permeability rating than plastic sheeting vapor barriers and consequently reduce the buildup of moisture, which can cause mold growth. Sometimes a thermally reflective surface called a radiant barrier is added to a material to reduce the transfer of heat through radiation as well as conduction. An aluminum foil radiant barrier can be placed either way - the shiny side is created by the rolling mill during the manufacturing process and does not affect the reflective of the foil material. The Air Movement and Control Association (AMCA) defines an air curtain as: "A directionally-controlled airstream, moving across the entire height and width of an opening, which reduces the infiltration or transfer of air from one side of the opening to the other and/or inhibits flying insects, dust or debris from passing through". Both technologies are often utilized in tandem; when the solid door is opened the air curtain turns on, minimizing air exchange between inside and outside.

An air door or air curtain is a device used to prevent air, contaminants, or flying insects from moving from one open space to another. Xu, J., Guo, H., Zhang, Y., and Lyu, X. "Effectiveness of personalized air curtain in reducing exposure to airborne cough droplets," Build. Under ideal conditions of zero wind, the effectiveness of the air door is at its maximum, but in windy locations air doors cannot create a perfect seal, but are still often used to reduce the amount of infiltration from an opening. Air doors work best when the pressure differential between the inside and outside of the building is as close to neutral as possible. The most effective air door for containing conditioned air inside a building with an open door will have a high face velocity at the opening, generated by top-down flow, and air recovery by a recirculating air plenum and duct return to the source fans. This is because unavoidable temperature and/or pressure loss that occurs as steam travels from the boiler to the machinery will cause some condensation, resulting in liquid water being carried into the machinery. Icynene will expand up to 100 times it original size within the first 6 seconds of being applied.

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