Correspondence :
November 22, 2005
CITY OF TIGARD
OREGON
Cal Arc
Charles C Lea
1683 Walnut Grove Ave, Suite #301
Rosemead, CA 91770
RE: MECHANICAL SYSTEM / EXHAUST DUCT SYSTEM / HOODS
Project Information
Building Permit: MEC2005 -00753 Construction Type:2 B
Tenant Name: Panda Express Occupancy Type: B
Address: 9641 SW Washington Sq Occupant Load: 5
Area: 876 Sq Ft Stories: 2
The plan review was performed under the State of Oregon Mechanical Specialty Code
(OMSC) 2004 edition; The submitted plans are approved subject to the following.
1. Provide automatic fire suppression systems for to type 1 hood prior to final inspection.
"Automatic fire suppression systems, including pre - engineered and engineered dry- and
wet - chemical fire - suppression systems, shall be listed and labeled for specific use as
protection for commercial cooking operations and shall be installed in accordance with
Section 304.1." 509.2 OMSC
2. Type I hoods shall be secured in place by non - combustible supports. All Type I and Type
II hood supports shall be adequate for the applied load of the hood, the unsupported
ductwork, the effluent loading, and the possible weight of personnel working in or on the
hood. 507.6 OMSC
3. External hood joints, seams and penetrations for Type I hoods shall be made with a
continuous external liquid -tight weld or braze to the lowest outermost perimeter of the
hood. Internal hood joints, seams, penetrations, filter support frames, and other appendages
attached inside the hood shall not be required to be welded or brazed but shall be otherwise
sealed to be grease tight. 507.7.1 OMSC
4. Duct- to- exhaust fan connections shall be flanged and gasketed at the base of the fan for
vertical discharge fans. 506.3.2.3 OMSC
5. Duct systems serving a Type I hood shall be constructed and installed so that grease
cannot collect in any portion thereof, and the system shall slope not less than one -fourth
13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772
unit vertical in 12 units horizontal (2- percent slope) toward the hood or toward an
approved grease reservoir. 506.3.7 OMSC
6. Grease duct bracing and supports shall be of noncombustible material securely attached to
the structure and designed to carry gravity and seismic loads within the stress limitations
of the Building Code. Bolts, screws, rivets and other mechanical fasteners shall not
penetrate duct walls. 506.3.3 OMSC
7. Equipment and appliances shall be installed as required by the terms of their approval, in
accordance with the conditions of the listing, the manufacturer's installation instructions
and this code. Manufacturer's installation instructions shall be available on the job site at
the time of inspection. 304.1 OMSC
8. Single or combined Type II exhaust systems for food - processing operations shall be
independent of all other exhaust systems. 506.4 OMSC
9. The building or structure shall not be weakened by the installation of mechanical systems.
Where floors, walls, ceilings or any other portion of the building or structure are required
to be altered or replaced in the process of installing or repairing any system, the building
or structure shall be left in a safe structural condition in accordance with the Building
Code. The cutting, notching and boring of framing members shall comply with OMSC
302 Sections 302.3.1 through 302.5.3.
10. Equipment and appliances regulated by this code requiring electrical connections shall
have a positive means of disconnect in accordance with the Electrical Code. 301.7 OMSC
11. Appliances shall be accessible for inspection, service, repair or replacement without
removal of permanent construction. 306.1 OMSC
12. Smoke detectors shall be installed in return air systems with a design capacity greater
than 2000 cfm. Upon activation, the smoke detector shall shut down the air distribution
system. Smoke detectors shall be connected to a fire alarm system and shall activate an
audible and visible alarm at a constantly attended location. 606.2, 606.4 & 606.4.1 OMSC
13. Ducts shall be supported with approved hangers at intervals not exceeding 10 feet
or by other approved duct support systems designed in accordance with the Building
Code. Flexible and other factory-made ducts shall be supported in accordance with the
manufacturer's installation instructions. 603.10 OMSC
14. Metallic Ducts shall be supported in accordance with Sheet Metal & Air Conditioning
Contractors National Association, Inc. (SMACNA) — Metal and Flexible. OMSC 603.4
15. Condensate from cooling coils or evaporators shall be collected and discharged to an
approved plumbing fixture or disposal area. OMSC 307.1
16. A cooling tower used in conjunction with an air conditioning appliance shall be installed
in accordance with the manufacturer's installation instructions. OMSC 908.1
17. If system used the Hydronic piping systems other than ground source heat pump loop
systems shall be tested hydrostatically at one and one half times the maximum system
design pressure, but not less than 100 psi (689 kPa). The duration of each test shall be not
less than 15 minutes. 1208.1 OMSC
Mercury Thermostats. The State of Oregon prohibits the installation of thermostats that
contain mercury in commercial and residential buildings. "In accordance with ORS 455.355,
the disposal of thermostats that contain mercury shall be in accordance with programs
established by thermostat manufacturers, their representative or distributor, or by delivery to
sites that will ensure that the mercury does not become part of the solid waste stream or
wastewater."
Approved Plans: 1 set of approved plans, bearing the City of Tigard approval stamp, shall
be maintained on the jobsite. The plans shall be available to the Building Division inspectors
throughout all phases of construction. 106.4.2 OSSC
When submitting revised drawings or additional information, please attach a copy of the
enclosed City of Tigard, Letter of Transmittal. The letter of transmittal assists the City of
Tigard in tracking and processing the documents.
Respectfully,
Val Henzel,
Senior Plans Examiner
1