ASHRAE 170 Table 7-1 / FGI Guidelines

ASHRAE 135-2016

A BACnet gateway does not satisfy a native BACnet requirement. The specification explicitly requires BACnet per ASHRAE 135-2016 and prohibits proprietary protocols. A gateway creates a single point of failure, adds latency, limits functionality (not all BACnet services translate through gateways), and locks the owner into one vendor for the field-level devices. Native BACnet means every controller communicates BACnet natively — either BACnet/IP or BACnet MS/TP — without translation. This is a critical specification requirement designed to protect the building owner from vendor lock-in.

ASHRAE 135-2016 / Crestline BAS Specification

Crestline specifications require all building automation systems to comply with ASHRAE Standard 135-2016 (BACnet). Proprietary, closed-protocol systems lock the owner into a single vendor and prevent competitive service and integration. Open-protocol BACnet is mandatory for all new installations.

ASHRAE 170 Table 7-1

This installation meets ASHRAE 170 Table 7-1 requirements for operating rooms. The standard requires a minimum of 20 total ACH with at least 4 ACH of outdoor air. The positive pressure relationship to corridors prevents unfiltered corridor air from entering the sterile environment. HEPA filtration and laminar flow delivery over the surgical table are best practices aligned with FGI Guidelines Section 2.1-3.2 for reducing surgical site infection risk. All specified parameters are at or above the minimum code requirements.

ASHRAE 170 Table 7-1 / FGI Guidelines 2.1-3.2

This fails on multiple counts. First, ASHRAE 170 Table 7-1 requires a minimum of 12 total ACH in AII rooms — the 10 ACH provided is below the minimum. Second, AII rooms must maintain negative pressure (minimum -0.01 inches w.g.) relative to adjacent spaces, which requires the exhaust rate to exceed the supply rate — not equal it. Neutral pressure provides no directional airflow control and allows infectious aerosols to escape when doors open. Third, while HEPA filtration on the exhaust is good practice, it does not compensate for inadequate air changes or incorrect pressure relationships. The room as designed would not contain airborne pathogens.

ASHRAE 62.1

ASHRAE 62.1 requires outdoor air determined by the ventilation-rate procedure — for offices, 5 CFM per person plus 0.06 CFM per square foot — not an arbitrary fixed percentage. Run the numbers: 20 occupants need 100 CFM of people-OA plus the floor-area component (a 2,000 sq ft zone adds 120 CFM, totaling ~220 CFM). Whether '15% OA' delivers that depends entirely on the unit's supply airflow — a 2,000 CFM unit at 15% provides 300 CFM (passes), a 1,200 CFM unit provides 180 CFM (fails). A percentage setpoint with no calculation behind it isn't a compliant ventilation design.

ASHRAE 62.1 — Section 6.2 (Ventilation Rate Procedure)

Minimum outdoor air position must meet the zone ventilation requirements of the Ventilation Rate Procedure during occupied mode — it can never be 0%. ASHRAE 62.1 ventilation rates apply whenever the space is occupied, so a 0% minimum during occupancy starves the space of required outdoor air and is a code violation. (0% is only acceptable during UNOCCUPIED periods, where ASHRAE 90.1 actually encourages closing the OA damper to save energy.)