PDX 2026-513 (42) M5.01.pdf
PDF 205 KB Posted
- Solicitation number
- 145968
- Issued by
- Multnomah County, Oregon
About this file
This is a mechanical design details document prepared by ARRIS Consulting for the Portland International Airport Customs and Border Protection Improvements Phase 2 project in Oregon. The document, dated September 8, 2026, provides technical specifications and installation requirements for HVAC ductwork systems, including terminal units, branch ducts, diffusers, and related mechanical components. The drawings specify detailed construction standards for low-loss branch duct connections, terminal unit installations with reheat coil sections, duct liner requirements, seismic bracing specifications, and flexible duct connections to ceiling diffusers. Installation requirements include minimum straight duct runs equal to four times the inlet diameter, 36-inch clearance requirements for controllers and damper actuators, pressure-independent delta P control valves, drain and vent valves, and compliance with 2005 SMACNA HVAC Duct Construction Standards.
The document establishes critical dimensional and construction parameters for the mechanical installation, including maximum offset angles of 15 degrees for flexible duct connections, minimum 4-foot downstream spacing for first branch ducts, maximum transition angles of 15 to 30 degrees depending on configuration, and minimum 5-foot lined duct requirements. The project is designed by A. Craig and B. Butler under the direction of engineer Brian Butler of ARRIS Consulting, with design number 1031462025D042 and project number PDX 2026-513. The specifications reference supporting floor plan drawings and require contractor compliance with all noted technical requirements for proper HVAC system functionality and code adherence.
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Text version
TWO-WAY PRESSURE INDEPENDENT
DELTA P CONTROL VALVE
1. INSTALL PIPING COUNTER FLOW TO AIR FLOW.
DRAIN VALVE (3/4")
VENT VALVE
NOTES
AIR
FLOW
HWR
HWS
STRAINER
TEST PORT, TYP.
SHUT-OFF VALVE, TYPICAL
4 FEET MIN.
TERMINAL UNIT
LOW VELOCITY SUPPLY DUCT.
PROVIDE DUCT LINER IN
DISCHARGE DUCTWORK AS
SHOWN ON PLAN DRAWINGS.
TERMINAL UNIT
CONNECTION
DUCTWORK
RUNOUT DUCT - SIZE
AS SCHEDULED
PROVIDE 36" CLEARANCE IN
FRONT OF TU CONTROLLER &
DAMPER ACTUATOR.
NOTES:
INLET
UNIT CONTROLLER
REHEAT COIL SECTION
CONNECTION, TYP
SLIP AND DRIVE CLEAT
1. BRANCH DUCT SIZE TO MATCH UNIT INLET CONNECTION. FOR BRANCH DUCTS OVER FIVE
FEET IN LENGTH, INCREASE BRANCH DUCT ONE SIZE AND PROVIDE TRANSITION
IMMEDIATELY UPSTREAM OF MINIMUM STRAIGHT DUCT RUN.
2. MINIMUM 5'-0" LONG LINED DUCT.
3. MINIMUM STRAIGHT DUCT RUN SHALL BE EQUAL TO 4 TIMES THE INLET DIAMETER OF TERMINAL UNIT.
TRANSITION FITTING, MAX.
15°, WHERE REQUIRED
BRANCH DUCT,
SEE NOTE 1
DISCHARGE LINED DUCT,
SEE NOTE 2
TRANSVERSE AND LONGITUDINAL
SEISMIC BRACING (EACH SIDE)
FIRST BRANCH DUCT
4. FIRST BRANCH DUCT DOWNSTREAM OF TERMINAL MUST BE A MINIMUM OF 4 FEET
DOWNSTEAM OF TERMINAL UNIT.
ATTACH HANGERS AND SEISMIC SUPPORTS
TO STRUCTURE ABOVE PER CODE
REQUIREMENTS
MEDIUM
PRESSURE
DUCT
MIN. STRAIGHT DUCT, SEE NOTE 3 TERMINAL UNIT 5" +/-
4'-0" MINIMUM
1.5 X D
WHETHER SHOW ON THE FLOOR PLAN OR NOT.
1. ALL BRANCH TAKE-OFFS SHALL HAVE A LOW LOSS FITTING
NOTE:
RECTANGULAR TO ROUND
LOW - LOSS FITTING
PRESSURE DUCT SEALER
SCREWS & SEAL WITH MEDIUM
ATTACH WITH SHEET METAL
LOW - LOSS FITTING
RECTANGULAR
RECTANGULAR TO
H
1.5 X W
D
PROVIDE AIR EXTRACTOR WITH
EXTERNAL OPERATING KNOB WHERE
45° BRANCH TAKEOFF CANNOT BE
INSTALLED.
DETAIL NOTES:
1. DUCT LINER NOT SHOWN FOR CLARITY.
2. FOR ADDITIONAL DETAIL, DUCTWORK SHALL BE
CONSTRUCTED PER 2005 SMACNA HVAC DUCT
CONSTRUCTION STANDARDS.
3. DUCT OFFSETS AND TRANSITIONS MAY CONVERT DUCT
PROFILES TO ANY COMBINATION FOR RECTANGULAR,
ROUND OR FLAT OVAL SHAPES.
45° BRANCH SUPPLY
OR RETURN
DUCT OFFSETS
AIR FOIL TURNVANE
ELBOW
RADIUS ELBOW TRANSITION
DUCT TRANSITION
WITH DUCT COIL
INNER
RADIUS = 6"
MIN
TURN
VANES AS
SPECIFIED
1-1/2" W
MIN
MANUAL
BALANCIN
G DAMPER
ACCES
S
DOOR
COI
L
30° MAX
15° MAX.
30° MAX.
OVER 30°
15° MAX
45.00°
W /4
M
IN
30° MAX
15° MAX.
W
PLAN VIEW
LINED SHEET METAL BOOT
SHEET METAL DUCT
CEILING
PLAN VIEW
DUCT SIZE IS THE SAME
AS NECK CONNECTION
OF DIFFUSER
MAX 36" FLEXIBLE DUCT
FLEX DUCT
ELBOW
SUPPORT
CEILING DIFFUSER CEILING
PLAN VIEW
EQUALIZING
DEFLECTOR WHERE
SPECIFIED
RECTANGULAR
SHEET METAL
DUCT
CEILING
PLAN VIEW
LINED SHEET METAL BOOT
SHEET METAL DUCT
CEILING
FLEXIBLE DUCT
MAXIMUM OFFSET IN HORIZONTAL AND VERTICAL
PLANE TO BE 15 DEGREES FOR FLEXIBLE DUCT
CONNECTION TO DIFFUSER BOOT COLLAR.
FASTEN FLEXIBLE DUCT TO SHEET METAL DUCT
PER SPECIFICATIONS.
WIDTH OF
DIFFUSER
NECK
WIDTH OF DIFFUSER NECK
A R R I S 2622 SE 25th Ave Ste #A Portland, OR 97202
Brian Butler, P.E.
brian@arris-consulting.com 503-309-6335
C O N S U L T I N G
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G R
A P
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IC
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-F O
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O N
L Y
DRAWING SCALE IS REDUCED 50% WHEN SHEET SIZE IS 11" x 17".
SUBMITTED BY
DESIGNED BY
DRAWN BY
CHECKED BY
DATE
SHEET NO.
DRAWING NO.
TYPE
DISC. SHT. NO.
DESIGN NUMBER PROJECT NUMBER
NO. DATE BY REVISIONS
A
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NO. DATE BY REVISIONS
A
PP
IF ELECTRONIC SIGNATURE IS BROKEN OR MISSING - THIS IS NOT A LEGAL DRAWING
DATE
SHEET NO. TYPE
DESIGN NUMBER PROJECT NUMBER
D R
A W
IN
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I S x
9/8/2026 9:17:24 AM Autodesk Docs://PDX Airport CBP Improvements/PDX Airport CBP Improvements - Arris_R26.rvt
DETAILS 1 - MECHANICAL
PORTLAND INTERNATIONAL AIRPORT
M5.01
SEPTEMBER 2026
A. CRAIG
B. BUTLER
B. BUTLER
JAY OSTLUND
CUSTOMS AND BORDER PROTECTION IMPROVEMENTS PHASE 2
PDX 2026-513
42 CD
1031462025D042
NTS
TERMINAL UNIT HW COIL PIPING DETAIL
NTS
TERMINAL UNIT
NTS
TERMINAL UNIT DETAIL
NTS
LOW LOSS BRANCH DUCT CONNECTION DETAIL
NTS
DUCT CONSTRUCTION
NTS
DIFFUSER GRILL & REGISTER CONNECTION
BrianButler Image
BrianButler Text Box 12-31-27
| 2026-09-08T09:25:17-0700 | |
| Brian Butler |
File details come from the government source that posted it. Updated .