- 1. Add two 1800 CFM transfer grilles between the Lab and the office space for Lab general exhaust makeup air.
G. Mechanical Room:
H. Live Feed Room:
- Replace all existing grilles and diffusers with new grilles, containing face dampers to allow for air balancing below the ceiling, removing the need to access the existing manual volume dampers in the attic. The estimated cost is $4,750.
- Replace both natural draft water heaters with new force draft, direct vent type, natural gas water heaters. Direct venting water heaters eliminate the need for combustion air louvers and the existing large gas fired unit heater in the mechanical room. The estimated combined cost for both water heaters is $36,700.
- Remove the unit heater from the mechanical room and replace it with a 3-kW electric unit heater. The estimated cost is $2,600.
- Replace electric heater with a new 4 kW electric heater. The estimated cost is $3,250.
- Emergency Generator:
- Relocate the existing generator based on the placement of the DOAS-1 unit. The estimated cost to relocate the generator with underground wiring rework is $8,600.
As an alternate, we recommend replacing the generator and transfer switch, which are also beyond their useful service life. The total cost to replace the generator is an additional $12,500.
IV. Proposed Electrical System Modifications
A. Power Upgrades
- Extend existing power and control conductors to new location of emergency generator.
- Rework existing power wiring to fans being replaced.
- Provide power circuits to new fans and duct heaters.
- Provide means of disconnect for each fan and heater in accordance with NEC.
- Provide power to new domestic water heaters and unit heater in mechanical room.
V. Design and Construction Schedule
B. Equipment lead times
- i.The estimated lead time of the DOAS-1 unit is 6 weeks. The duct heaters, unit heaters, fans, etc. should have similar if not shorter lead times.
- ii.An alternate DOAS manufacturer has quoted a 25 week lead time for their equipment.
End of Report
Narrative Attachments:
Phase A Construction Cost Opinion / Phase A Schematic Drawings
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