Labconco Hooded Combination (Macro) Kjeldahl Systems 21178 Series - Manual (Page 11)

Chapter 2: Installation
Product Service 1-800-522-7658 7
Sash Assembly
The glass sashes are packaged separately and are installed into the hood assembly,
by inserting the upper edge into its track first and then positioning the lower edge
over the nylon runners in the lower sash track. See Figure 1-2 and Figure 2-8 for
illustration of glass sashes.
Electrical Connection
The electrical line for the lights in the bonnet section of the hood assembly need
to be connected to the lead wires coming off of the light switch that is located on
the substructure of the hood assembly. Wire nuts have been supplied to aid in this
connection.
Hood Exhaust System
The hood superstructure is fitted with a 10-3/4" I.D. duct work connection shown
below. This duct work connection is used to remove the heat build up which
occurs during normal operation inside the unit superstructure. Specific airflow
requirements for each size of hood are shown in the air volume chart (see
dimensional specification drawing in Appendix B). The duct work system should
be made of an acid resistant material. It is recommended that a Laboratory HVAC
technician with experience in the design and sizing of chemical fume removal
systems be consulted.
Hood Auxiliary Air System
The hood superstructure is fitted with a 10-3/4" I.D. duct connection (shown
below) to allow for the auxiliary air to be supplied into the hood. This air will be
exhausted out through the hood exhaust connection with additional room air and
the heat load that builds up inside the hood structure.
The auxiliary make up air system is used when the existing room environment
does not supply enough air to the hood to adequately remove the heat build up
that is experienced.
Specific airflow requirements for each size of hood are shown in the air volume
chart (see dimensional specification drawing in Appendix B).
Figure 2-1