7
The access and working openings must be kept to
a minimum. Whenever possible, they must also
be kept away from the contaminated airflow. Any
inspection and maintenance openings should be
provided with tight doors whenever possible.
A hood that is open and does not enclose or
confine the contaminant should be avoided. Open
hoods can be used but exhaust volumes must be
large and cross drafts nearby can easily upset
draft control.
Canopy hoods are effective in controlling
operations that may suddenly release surges of
gases and vapors. Hot processes are an
example.
However, canopies should not be used where
people may be working in the airflow between
contaminant source and canopy because exhaust
airflow can actually incr
ease the worker’s
exposure to the contaminant. Plating tanks and
cementing tables typically have this problem with
canopy-type hoods.
The duct takeoff in the exhaust hood should be
located in the normal line of contaminant travel.
Arrange the duct openings to distribute the
exhaust airflow throughout the hood. This is
especially important with large, shallow hoods
where air movement tends to concentrate close
the duct opening. The airflow can be spread
around the hood by using multiple duct takeoffs,
interior baffles or filter banks.
Air intake from areas not needing airflow or
without contaminants can be controlled with
flanges. Flanges minimize airflow from areas
outside the desired air collection area. Usually the
flange width is equal to the hood diameter but not
exceeding six inches (152.4 mm). Flanges may
increase the effectiveness of the hood allowing a
reduction in hood airflow requirements by up to
25 percent.
Exhaust airflow requirements are calculated after
the hood design is determined. The airflow
volume is calculated using the enclosure’s known
open area and the airflow velocity needed to
collect the contaminants. The collected airflow
must be sufficient to prevent the escape of any
contaminated air.
ASSEMBLY
- CAUTION -
Do NOT connect the power source until after the
air cleaner is completely assembled.
If the air cleaner must be turned on for an
electrical check, be extremely careful in avoiding
electrical shock. Also, take care to avoid the air
cleaner’s moving parts.
WHEN ASSEMBLING THIS PRODUCT
Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
Check the electrical ratings given on the air
cleaner schematic to the power source to insure
compatibility.
After assembly is complete, check out the product
operation as provided in these instructions.
UNPACKING
Remove all shipping cardboard and banding. Be
sure to inspect the packaging material before
discarding it.
ASSEMBLING THE M660
Unit should be securely anchored to the floor to
prevent the unit from tipping.
Your M66O comes standard with a 1
” schedule 40
drain pipe. A trap must be installed in the drain
line with at least
an 8” rise or 8” diameter loop (see
diagram). Prime trap with liquid that will be
collected to break air suction in filter compartment
when air cleaner is operating.
Summary of Contents for M660
Page 12: ...12 PARTS IMAGES ...