Operating Room Air Distribution & Ceiling Systems Room Air... · 9/16/2013 1 Operating Room Air...

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9/16/2013 1 Operating Room Air Distribution & Ceiling Systems Operating Room Solutions Agenda Operating Room Solutions – Introduction Air Distribution – Ceiling Systems – Summary

Transcript of Operating Room Air Distribution & Ceiling Systems Room Air... · 9/16/2013 1 Operating Room Air...

9/16/2013

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Operating Room Air Distribution & Ceiling

Systems

Operating Room SolutionsAgenda

Operating Room Solutions– Introduction

– Air Distribution

– Ceiling Systems

– Summary

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ASHRAE 170• Ventilation of Health Care Facilities (2008)

• First release of this standard

• Widely adopted in North America

Introduction – O.R. SolutionsApplicable Standards

ASHRAE 170• Ventilation of Health Care Facilities (2008)

• First release of this standard

• Widely adopted in North America

Facility Guidelines Institute (FGI)• Guidelines for Design and Construction of

Health Care Facilities (2010)

• Supersedes AIA/FGI 2006 Guidelines

• Adopted ASHRAE 170 for all HVAC requirements

Introduction – O.R. SolutionsApplicable Standards

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Operating Room SolutionsAir Distribution

Laminar Flow Systems Air Curtain Systems

Air Distribution – O.R. SolutionsSystems

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Laminar Flow Systems• Laminar diffuser array

concentrated above surgical zone

• Displace particulates to low-level returns

Air Distribution – O.R. SolutionsLaminar Flow Systems

Benefits• Widely accepted design

• Supporting research

• Optional integrated filters

Air Distribution – O.R. SolutionsLaminar Flow Systems

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Ceiling Space• Diffusers consuming

valuable ceiling space

• 25 to 35 cfm/ft2 (fpm) average face velocity

(ASHRAE 170 – 2008)

Air Distribution – O.R. SolutionsLaminar Flow Systems

Hybrid O.R. Challenges

Air Distribution – O.R. SolutionsLaminar Flow Systems

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Acceleration• Result of ∆T between

supply and room air

• Archimedes principle– ASHRAE RP-1397

Air Distribution – O.R. SolutionsLaminar Flow Systems

Acceleration• Tapering column of supply air

Air Distribution – O.R. SolutionsLaminar Flow Systems

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Air Distribution – O.R. SolutionsLaminar Flow Systems

Air Curtain Systems• Smaller laminar array

• Perimeter slot diffusers– 25 to 45 cfm/ft discharge

(15˚ outward from vertical)

• Displace particulates to low-level returns

Air Distribution – O.R. SolutionsAir Curtain Systems

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Air Distribution – O.R. SolutionsASHRAE 170 Requirements

Laminar Flow Diffusers

Air Distribution – O.R. SolutionsASHRAE 170 Requirements

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“Primary”Laminar Flow Diffuser

discharge velocity

Air Distribution – O.R. SolutionsASHRAE 170 Requirements

“Primary” Laminar Flow Diffuserminimum coverage

Air Distribution – O.R. SolutionsASHRAE 170 Requirements

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ANY vertical discharge diffuser(i.e. Laminar Flow Diffuser or Perimeter Air Curtain Diffusers)

Air Distribution – O.R. SolutionsASHRAE 170 Requirements

• 480 ft2 room

• 10 ft ceiling

• 20 ach ≈ 1600 cfm

Air Distribution – O.R. SolutionsSystem Sizing Example

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• 12” offset from surgical table (per ASHRAE 170, 2008)

Air Distribution – O.R. SolutionsSystem Sizing Example

• Laminar flow diffusers only in “Primary Supply Diffuser Array Area” (per ASHRAE 170, 2008)

Air Distribution – O.R. SolutionsSystem Sizing Example

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• MAX 30% for non-diffuser equipment

• 25 to 35 cfm/ft2(per ASHRAE 170, 2008)

• 25 cfm/ft2 = 600 cfm

Air Distribution – O.R. SolutionsSystem Sizing Example

• Diffuser layout flexible if minimum coverage satisfied

Air Distribution – O.R. SolutionsSystem Sizing Example

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• Inside perimeter of air curtain diffusers:

• 2 ft offset from Primary Diffuser Array Area

• 3 ft offset from surgical table

Air Distribution – O.R. SolutionsSystem Sizing Example

• Active linear slot ≈ 40 ft

• Air curtain flow (min.)

• 1600 cfm – 600 cfm = 1000 cfm

• 1000 cfm / 40 ft = 25 cfm/ft

Air Distribution – O.R. SolutionsSystem Sizing Example

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Air Curtain System Laminar System 480 ft2

20 ach

Air Distribution – O.R. SolutionsSystem Sizing Example

Air Curtain System Laminar System 600 ft2

20 ach

Air Distribution – O.R. SolutionsSystem Sizing Example

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Air Curtain System Laminar System 600 ft2

25 ach

Air Distribution – O.R. SolutionsSystem Sizing Example

Isolation of surgical zone

Air Distribution – O.R. SolutionsAir Curtain Systems

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Air Distribution – O.R. SolutionsAir Curtain Systems

Air Distribution – O.R. SolutionsAir Curtain Systems

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Why worry about velocity?• Contamination from surgical team

• Match thermal plume

• Comfort

Air Distribution – O.R. SolutionsAir Curtain Systems

Draft potential• Consider the locations of

staff in the O.R. (i.e. Anesthesiologist)

Duct configuration• Ensure laminar flow and

perimeter air curtain diffusers are fed from separate duct branches

Air Distribution – O.R. SolutionsAir Curtain Systems

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Air Distribution – O.R. SolutionsAir Curtain Systems

J. Swift, E. Avis, B. Millard, T.M. Lawrence. “Air Distribution Strategy Impact on Operating Room Infection Control.” 2007

Air Distribution – O.R. SolutionsAir Curtain Systems

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J. Swift, E. Avis, B. Millard, T.M. Lawrence. “Air Distribution Strategy Impact on Operating Room Infection Control.” 2007

Air Distribution – O.R. SolutionsAir Curtain Systems

Air Distribution – O.R. SolutionsSlot Style & Configuration

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Operating Room SolutionsCeiling Systems

1960s1920s

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Now2000s

O.R. Grid Ceiling Systems• Extruded aluminum profiles

• Variety of finishes

• Closed cell gasket

• Removable panels

• Customizable layout

Ceiling Systems – O.R. SolutionsIntroduction

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Advantages of O.R. Ceiling Systems• Improved aesthetics

• Convenient ceiling plenum access

• Better use of ceiling space

• Reduced construction time / cost

Ceiling Systems – O.R. SolutionsAdvantages

Ceiling Systems – O.R. SolutionsFGI 2010 Guidelines

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Sheetrock

Ceiling Systems – O.R. SolutionsFGI 2010 Guidelines

Sheetrock

Exception for gasketed ceilings

Ceiling Systems – O.R. SolutionsFGI 2010 Guidelines

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Standard Extruded frame

Ceiling Systems – O.R. SolutionsFill-in Panels

Flush Mount Diffuser Match

Ceiling Systems – O.R. SolutionsFill-in Panels

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Brushed Aluminum

White Powder Coat

Clear Anodized

Ceiling Systems – O.R. SolutionsFinish Options

Unistrut® Integration• Mounting of C-Arm

support tracks

• Cath. labs

• Hybrid operating rooms

Ceiling Systems – O.R. SolutionsCeiling Types

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Integrated Plenum Systems• Pressurized common plenum

reduces duct connection requirements

• Easy balancing

• Custom designs to suit each operating room

Ceiling Systems – O.R. SolutionsCeiling Types

Ceiling Systems – O.R. SolutionsCeiling Types – Integrated Plenum Systems

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38 penetrations - 378 linear feet 7 penetrations - 90 linear feet

Ceiling Systems – O.R. SolutionsCost Comparison

Surface Mounting Gasketed Grid Ceiling

Surface Mounting

Number of openings 38

Cut, finish, frame openings $14,700

Plaster frames (installed cost) $3,100

Access doors $1,100

Estimated Total $18,900

38 penetrations - 378 linear feet

Estimates by installing contractor

Ceiling Systems – O.R. SolutionsCost Comparison

Surface Mounting

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Factory Welded Grid System

Number of openings 7 (6 can lights)

Factory Welded Grid $6,300

Cut, finish, frame openings $3,800

Fill-in panels $1,300

Grid/panel installation $3,500

Actual Total $14,900

7 penetrations - 90 linear feet

Ceiling Systems – O.R. SolutionsCost Comparison

Gasketed Grid Ceiling

$18,900 installed (excluding diffusers) $14,900 installed (excluding diffusers)> 20% savings over surface mounting

Ceiling Systems – O.R. SolutionsCost Comparison

Surface Mounting Gasketed Grid Ceiling

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Operating Room SolutionsSummary

• Both air curtain and full laminar flow systems can offer effective protection for the patient if designed correctly

• Grid ceiling systems offer significant benefits over conventional sheetrock ceilings

Operating Room SolutionsSummary

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Questions?