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Equipment Overview
The AstroHood
™
S-l & S-ll Ducted HEPA Terminal Hoods are a critical component to ensure filtration
system integrity and air cleanliness downstream of HEPA filters. The S-l unit offers a fully seal-
welded housing body with no penetrations of the pressure boundary. The S-ll unit employs full welds
downstream (clean side) of the HEPA filter and a riveted and caulked design upstream (dirty side).
Both the S-l and S-ll units are factory-pressure tested to 3” w.g. to guarantee a leak-free product is
supplied. These units may be installed in a variety of ceiling types, including T-bar ceilings and plaster
ceilings.
Both the S-l and S-ll units are available in either 304 Stainless Steel or Aluminum construction with a
variety of inlet options, top or side, and round or rectangular. Both units are supplied standard with an
aerosol injection & dispersion system, as well as static pressure/upstream aerosol concentration port.
The S-l unit is supplied with the industry-leading Energy-Saving Damper (ESD) which provides the
lowest operational pressure drop and, thus, energy savings, of any damper configuration available. Its
pressurized plenum design also leads the industry in airflow uniformity. The S-ll unit comes standard
with Guillotine damper, but Spilt Butterfly or ESD damper options are available.
All standard mounting and trim options are available: wire suspension, rod suspension, grid/T-bar
ceilings, and clean ceiling angles, along with permanent flange or field-installed trim, as well as a
variety of grille and insulation options.
AstroHood S-l & S-ll units are available in many configurations and sometimes are supplied custom.
Please reference order-specific data sheets and/or submittal drawings for more information.
Unpacking
• Carefully remove the unit from the shipping carton and inspect for any damage that may have
occurred during transportation. Two workers minimum are required to lift the unit from the
container.
• Remove housing from packing material and inspect for concealed damage and any hardware that
may have become loose in transit.
• Remove the Grille and Field-installed Trim, if supplied, and set aside. It is good practice to label or
mark the grille and trim components to match with the respective unit to ensure a good fit.
