Additional Tunnel Heating-M-4.pdf

PDF 220 KB Posted Apr 3, 2026

Attached to: Steam Tunnel Ventilation Replacement Federal contract opportunity
Solicitation number: NB196000-26-00830
Issued by: Department of Commerce National Institute of Standards and Technology

About this file

Written by GovTribe AI · Apr 3, 2026

This is a mechanical equipment schedule and specification document for the Building 42 Tunnel Ventilation project at the National Institute of Standards and Technology (NIST) in Boulder, Colorado.

The document specifies three categories of mechanical equipment required for the tunnel ventilation system. The Automatic Air Damper Schedule requires six Greenheck VCD-20 dampers, each 24x18 inches with a maximum capacity of 2,000 CFM at 600 FPM velocity and 24V actuators. All dampers shall be normally closed with positive feedback actuators, and their mounting must be coordinated with the controls contractor. The Direct Fired Gas Make Up Air Unit Schedule specifies one Greenheck DGX unit (designation 42-MAU-001) capable of 12,000 CFM total at 5,280 feet elevation with a 5 HP direct-drive fan operating at 1,272 RPM. This unit includes direct gas heating with 1,200.0 MBH input and 1,104.0 MBH output, operating at 5 PSIG gas pressure, with a MERV-8 filter and 480/3 voltage configuration. The Unit Heater Schedule (Electric) requires three Indeeco UHIR electric unit heaters (designations 42-T-UH-001 through 42-T-UH-003), each rated at 10.0 KW, 480/3 voltage, 12.4 total amps, with horizontal discharge at 9-foot mounting height. All three unit heaters require cantilever arm mounting, power disconnect switches, integration with the building JCI control system, and 2-stage control capability. The design approval date is 3/10/2026.

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Other files for this federal contract opportunity

Other files attached to Steam Tunnel Ventilation Replacement, newest first.
File	Type	Posted
Specifications.zip	ZIP file	Apr 3, 2026
DRAFT SOW - Steam Tunnel Ventilation.docx	DOCX document	Apr 3, 2026
001000 General Contractor Requirements and Site Standards.zip	ZIP file	Apr 3, 2026
Additional Tunnel Heating-M-1.pdf	PDF	Apr 3, 2026
Additional Tunnel Heating-M-2.pdf	PDF	Apr 3, 2026
Additional Tunnel Heating-M-3.pdf	PDF	Apr 3, 2026
01A NIST Boulder General Contractor Requirements.pdf	PDF	Apr 3, 2026
Additional Tunnel Heating-M-0.pdf	PDF	Apr 3, 2026

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AUTOMATIC AIR DAMPER SCHEDULE

DESIGNATION

AAD-1

AAD-2

AAD-3

AAD-4

AAD-5

AAD-6

MANUFACTURER

GREENHECK

MODEL

VCD-20

SIZE

24X18

MAX. CFM

2,000

VELOCITY

600 FPM

ACTUATOR

24V

NOTES:

DAMPERS SHALL BE NORMALLY CLOSED

COORDINATE ACTUATOR MOUNTING WITH CONTROLS CONTRACTOR

PROVIDE ACTUATORS WITH POSITIVE FEEDBACK

DIRECT FIRED GAS FIRED MAKE UP AIR UNIT SCHEDULE

SUPPLY FAN DATA

DESIGNATION

42-MAU-001

MANUF.

GREENHECK

MODEL

DGX

CFM TOTAL

@ 5280'

12,000 12,000 0.25

DRIVE TYPE

DIRECT

APPROX. RPM

1,272

MIN. FAN

EAT

°F DB

0.7

LAT

% EFF.

°F DB

104.0 92 1,200.0

MBH INPUT

GAS DIRECT HEATING DATA

MBH OUTPUT

@ 5280'

1,104.0

GAS PRESSURE

5 PSIG

FILTER DATA

PLENUM

TYPE

MERV-8 24

OPER. WEIGHT

(LBS.)

1,450

VOLTAGE/

PHASE

480/3

CURB HEIGHT.

CFM OA

@ 5280'

ESP

UNIT HEATER SCHEDULE (ELECTRIC)

DESIGNATION

42-T-UH-001

42-T-UH-002

42-T-UH-003

MANUFACTURER

INDEECO

MODEL

UHIR

DISCHARGE

HORIZONTAL

MOUNTING

HEIGHT

9 FT

10.0

VOLTAGE/

PHASE

480/3

TOTAL AMPS

12.4

NOTES

REFER TO BELOW

PROVIDE CANTILEVER ARM

NOTES

PROVIDE POWER DISCONNECT SWITH

UNIT CONTROLLED BY BUILDING JCI CONTROL SYSTEM

PROVIDE 2 STAGE CONTROL

SHEET NUMBER

PROJECT NAME of

325 BROADWAY BOULDER, COLORADO 80305-3328

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY

DATEDESIGN APPROVAL

BOULDER DESIGN AND CONSTRUCTION DIVISION

DATESUPV.BYDESCRIPTIONREVISION

3 DRAFTING

ADDITIONAL TUNNEL HEAT

COOK

BUILDING 42 TUNNEL VENTILATION

3/10/2026

M-4COOK

Sheets and Views

M-4

File details come from the government source that posted it. Updated Apr 3, 2026.