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Standard
Panel Construction
The Type
SL Panel—
A special
built-in connection system allows the Type SL panels to snap-lock together,
forming a low-leakage, structurally sound, full-length joint. This mechanical
interlocking joint requires no sheet metal screws. The three-step panel
locking sequence shown illustrates the snap-lock action of the connection.
First, one panel is started into the structural channel of the next panel.
As the panels are pushed together, the locking lugs spring out and then
snap back into position as the connection process is completed. Sealer,
which is placed in the outside panel groove prior to connection, is hydraulically
extruded in place as the panels are snap-locked together.
The Type
TG Panel—
The Type TG panels utilize a tongue-and-groove joint design where the
tongue end of one panel slips into the groove end of the adjoining panel.
Fasteners (screws) are required for securing the panel joint. For installations
where disassembly and re-erection may be required, it is recommended that
a removable joint sealer be used instead of the standard McGill AirSeal
United Duct Sealer™ sealant.
Material—
Both
SL and TG panels are available in a standard 4-inch thickness. A 2-inch
thickness is optional, with other thicknesses available by special order.
Standard panel widths are 24 inches and 36 inches, with standard lengths
up to 12 feet. Other widths and longer lengths are also available through
special order. For most enclosures, at least one special-width panel will
be required as a fill-in panel to match the specified dimensions of each
wall, floor, or roof assembly. Also, in most cases, maximum panel lengths
will be determined by the working design pressures.
The standard material for both the outer shell and inner
liner is galvanized steel. It can be specified as either solid or perforated
and has a minimum G-60 zinc coating. The perforated steel has 23 percent
open area. Many different material and gauge combinations of outer shell
and inner liner can be selected, with the inner liner being either solid
or perforated.
The standard acoustical/thermal fill material used
in Type SL and Type TG panels is 1.55 pcf fiberglass, giving the standard
4-inch-thick panel an R17 value. The fill will not settle or promote the
growth of bacteria, mold, vermin, or insects. A moisture barrier can also
be specified. This consists of one layer of polyethylene plastic separating
the insulation from the inner perforated metal liner.
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