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Omniguard™ 4 Owner’s Manual
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Engineering Solutions Inc
4. Calculating site airflow requirements:
A typical heavy duty HEPA fan/filter unit has a 1000 CFM (cubic
feet per minute) capacity with a new filter. Units are typically
derated by 25%, so a 1000 CFM unit is derated to 750 CFM by
the hygienists when calculating actual site airflow requirements.
Example #1: A room measuring 20 x 20 ft with a 10 ft ceiling
encloses 4000 CF of air. To meet the 4X per hour change
rate the fan/filter unit must be capable of pulling 267 CFM
of air (4000 x 4/60) from the containment area and maintain
a minimum negative pressure of -0.020”WC.
Example #2: Room size is 20 x 50 with 12 ft ceiling. Requires
(20 x 50 x 12) CF x 4 / 60 = 800 CFM or 2 units (of a 1000
CFM fan/filter unit... remember the fan/filter unit is derated
to 750 CFM).
Example #3: Room size is 100 x 100 with 16 ft ceiling.
Requires (100 x 100 x 16) CF x 4 / 60 = 10667 CFM or
15 fan/filter units (of a 1000 CFM unit).
5. The containment area pressure should be monitored at various
points to confirm adherence to abatement requirements.
Remember that air is a medium, and air pressure is not identical
throughout the containment area. The pressures at specific
locations within the containment area vary due to distance, room
temperature, proximity to openings, room geometry, etc. Typically
one manometer is used for every two “rooms” that have a doorway
and attached hallway, up to 1000 square ft.
5. Using a manometer that provides highly accurate pressure
readings, time stamped logging of all readings, and audible alarm
and printouts of all logged readings protects workers and the
public from accidental exposure to airborne hazards and provides
proof of containment to protect employers from environmental
contamination lawsuits.
NOTE: It is important that there be no kinks or
sharp bends in any part of the tubing. Any blockage
could inhibit accurate recording of the pressure in
the containment area.
Appendix D: Limited Warranty
Engineering Solutions warrants that all products, component parts
and accessories will, for a period of twelve (12) months from date of
purchase, be free from defects in material and workmanship under
normal use and service.
PURCHASER’S SOLE AND EXCLUSIVE REMEDY UNDER THIS
WARRANTY IS LIMITED TO THE REPAIR OR REPLACEMENT OF
DEFECTIVE PARTS F.O.B., ENGINEERING SOLUTIONS, INC., 6300
SOUTHCENTER BLVD, SUITE 209, TUKWILA, WA 98188.
To keep this warranty valid, the purchaser must (a) return signed
Registration card to Engineering Solutions within fifteen (15) days
of purchase, (b) have promptly informed Engineering Solutions’
customer service department of any defects in writing, (c) properly
used, maintained and repaired the Product, and (d) have proof of
purchase.
This warranty does not cover normal wear and tear or defects due to
(a) improper or negligent handling or unauthorized modifications, (b)
defective or improper premises, chemical, electrochemical or electrical
influences, (c) weather or other influences of nature.
LIMITATIONS OF WARRANTY - THIS WARRANTY IS EXPRESSLY IN
LIEU OF ANY AND ALL OTHER WARRANTIES AND OBLIGATIONS
OF ENGINEERING SOLUTIONS OR ITS SUPPLIERS, EXPRESS OR
IMPLIED. ENGINEERING SOLUTIONS EXPRESSLY DISCLAIMS
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
LIMITATION OF REMEDY- Under no circumstances shall Engineering
Solutions or any of its suppliers be liable for any loss or damage,
including, but not limited to, loss or damage arising out of failure of
the Product to operate for any period of time, inconvenience, use of
rental or replacement equipment, loss of profit or other economic
loss, or general, direct, special, indirect, incidental or consequential
damages or property damages.
PRODUCT SUITABILITY - Many states and localities have codes
and regulations governing sales, construction, installation, and/or
use of products for certain purposes, which may vary from those in
neighboring areas. While Engineering Solutions attempts to assure
that its Products comply with such codes, it cannot guarantee
compliance, and cannot be responsible for how the Products are
installed or used. Engineering Solutions recommends that, before
purchasing and using a Product, purchasers review the Product
application, and federal, state and local regulations, to be sure that
the Product, installation, and use will comply with them.
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