National Weatherization Conference Ventilation Best .... Nagan... · Cooking. 9. Breathing. 9....
Transcript of National Weatherization Conference Ventilation Best .... Nagan... · Cooking. 9. Breathing. 9....
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Home Building Technology ServicesHome Building Technology Services 1
Presented by
Joe NaganJoe Nagan, Home Building Technology Services
Ventilation Best Practices &Ventilation Best Practices &
airflow verificationairflow verification
National Weatherization ConferenceNational Weatherization Conference
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FIELD RESEARCHFIELD RESEARCH
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Objectives for this session:Objectives for this session:
Review ventilation design strategies
Review multiple installation challenges
Discuss YOUR YOUR concerns
NOTE: Questions are encouraged during this presentation, jump right in !
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Reasons to ventilateReasons to ventilate??PeoplePeople-- IAQIAQ
Building durabilityBuilding durability
PostPost--weatherizationweatherization
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BlowerBlower--door testing confirms door testing confirms tightness goalstightness goals!!
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ISSUESISSUES that that should beshould be considered:considered:INDOOR AIR QUALITYINDOOR AIR QUALITY
* ventilation:ventilation: fresh air and moisture control
COMBUSTION SAFETYCOMBUSTION SAFETY* back drafting: back drafting: sooting and combustion gases
TIGHTER BUILDINGS CHECKLISTTIGHTER BUILDINGS CHECKLISTTIGHTER BUILDINGS CHECKLIST
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“A house is said to have poor Indoor Air Quality when the inside air contains enough of a substance to adversely affect thecomfort, health or safety of the occupants”
Generally speaking;
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‘‘Natural draftNatural draft’’ water heater spillagewater heater spillage
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‘‘SEVERESEVERE’’ back drafting!back drafting!
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‘Moisture’ sources in homesConstructionBathingCookingBreathingPlantsPetsLifestyle/hobbiesUnsealed sump pitsHumidifiersCombustion appliances
Some Some too wettoo wet, some too dry, some too dry
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Bathroom issuesBathroom issues
moisturemoisture
odors odors
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MoistureMoisture or or temperaturetemperature problemproblem??
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‘‘PollutantPollutant’’ sources in homessources in homesHygiene productsCleanersCookingSmokingPetsLifestyle/hobbiesUnsealed sump pits Attached garagesCombustion appliances ‘Every home will be different’
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Bathroom sources: Bathroom sources: hygiene products/cleanershygiene products/cleaners
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Laundry room sources: Laundry room sources: cleaning products/softenerscleaning products/softeners
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Basement sources: Basement sources: catch all for junk and moisturecatch all for junk and moisture
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‘‘Ventilation strategiesVentilation strategies’’ & equipment& equipmentSpot exhaustSpot exhaust
Remote spot exhaust & multiRemote spot exhaust & multi--pointpoint
Balanced flow with Balanced flow with HeatHeat and/or and/or ENERGYENERGY recoveryrecovery
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Typical bath exhaust fan doing spot ventingTypical bath exhaust fan doing spot venting
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Rated for wet location w/GFI protectionRated for wet location w/GFI protection-- mount in showermount in shower
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Bathroom fan spot ventilation wall switchBathroom fan spot ventilation wall switch
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Typical bath exhaust fan doing double dutyTypical bath exhaust fan doing double duty**
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Bath fan mounted in main part of homeBath fan mounted in main part of home
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Acceptable whole building ventilation controlAcceptable whole building ventilation control
Mounted in the main part of home accessible to the owner. Wire in parallel with bathroom fan or remote spot fan doing double duty. (not 3-way operation)
Ventilation system
Many control options available- check with vendors
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Broan-Nutone model 744BroanBroan--NutoneNutone model 744model 744
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Can lightCan light
44”” exhaust ductexhaust duct
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Broan Broan ‘‘SmartSenseSmartSense’’Intelligent Ventilation systemIntelligent Ventilation system
Automates their Automates their QTXE QTXE 80/11080/110
cfm rated fanscfm rated fans
Uses house wiring to communicateUses house wiring to communicate
ASHRAE 62.2 readyASHRAE 62.2 ready
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66--inch connection allows for less restrictive ductinginch connection allows for less restrictive ducting
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XX--1010 automation technology automation technology
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Common house wiring is used !Common house wiring is used !
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PanasonicPanasonicAutomated fan
Low speed continuous
30-80 cfm
High speed boost
* 80 cfm
* motion sensor
* wall switch
* adjustable boost off time delay
* 1-60 minutes
ASHRAE 62.2 ready
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80 CFM high speed w/variable continuous80 CFM high speed w/variable continuous
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Occupancy sensor activation modelOccupancy sensor activation model
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Built in automation/controlsBuilt in automation/controls
Continuous Continuous CFMCFM speed controlspeed control
High speed High speed boost time delayboost time delay
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The The ‘‘ULTIMATEULTIMATE’’
ManMan’’s fan!s fan!
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Quiet remote inQuiet remote in--line fan combinationline fan combination
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Remote mounted exhaust ventilation systemRemote mounted exhaust ventilation system
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Mounting issuesMounting issues
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Dampers on each branchDampers on each branch
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Stack head mounted close to sourceStack head mounted close to source
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Very low power draw by fanVery low power draw by fan
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Stack headsStack heads can be used with most remote fans as well as with HRV/ERVHRV/ERV’’ss
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Very low power draw by CFLVery low power draw by CFL
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Range hoods should be ducted to the outsideRange hoods should be ducted to the outside
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Venmar S31301LSVenmar S31301LS 2 speed range hood
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CFLCFL’’ss will fit in cabinet!!
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LowLow spee speedd power draw
High speedHigh speed power draw
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Remember:Remember:
1 CFM out = 1 CFM in
We know where the air is leaving, where does the air come in
Applied physics and building science
?Always comply Always comply wwiith th code lcode liimmiits fts foor r ddee--pressuripressurizatzatiioonn
DeDe--pressuripressurizzaatitionon con conccernernss wiwith exhath exhaust onust onllyy
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Compact HRV/ERV whole house unitCompact HRV/ERV whole house unit--as small as 70 cfmas small as 70 cfm
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Very low Very low power consumption!!
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Broan Broan ERVERV90HC: 90HC: side or top connections
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BREEZE from RenewBREEZE from RenewAireAire
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PrePre--filtersfilters
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‘‘DIRECT MOUNTDIRECT MOUNT’’ HRV or ERV now availableHRV or ERV now available-- no blowersno blowers
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Control has both ASHRAE 62.2 or Control has both ASHRAE 62.2 or ‘‘%%’’ time run functionstime run functions
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Tandem Tandem termination fitting & grille
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Exhaust air outExhaust air out
Fresh air inFresh air in
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HRVHRV’’s and ERVs and ERV’’s have their own controlss have their own controls
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Line voltage dual function controlLine voltage dual function control
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HRV or ERV function:HRV or ERV function: balanced flow with balanced flow with HEATHEAT and/or and/or MOISTUREMOISTURE recoveryrecovery
Stale air from houseStale air from house
Fresh air from outsideFresh air from outside
Stale air to outsideStale air to outside
Tempered air to houseTempered air to house
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At this point we have only spent At this point we have only spent some MONEYsome MONEY!!
The only thing that matters is:The only thing that matters is:Does it work Does it work –– how wellhow well??
Did we meet our design goalsDid we meet our design goals??
yesyes//nono
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Benefits
The ONLY way to know if your equipment is working
Learn what does and doesn’t work
Reduce callbacks
Create paper trail
Manage expectations
Airflow testingAirflow testing
# 1 problem: Very few people test anything
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All ventilation systems All ventilation systems must be testedmust be tested for flowfor flow
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Poor ducting installationPoor ducting installation
# # 22 problem: NASTY restrictive ductworkproblem: NASTY restrictive ductwork
Exit grille here !
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80 CFM fan 480 CFM fan 4’’ from outside grille:from outside grille:tested airflow: 31 cfm31 cfm for a whoppingwhopping 39%39%
of rated airflow
What was the What was the designdesign airflow ?airflow ?
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Installation problemsInstallation problems
All trades must be on the same page:All trades must be on the same page:crushed piping courtesy of siding/grille installer
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Design airflow was Design airflow was 5050 cfmcfm
Removed excess ducting and retestedRemoved excess ducting and retestedNow have 6666 cfm or 83 %83 % of rated flow
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Smooth bend radius over top plateSmooth bend radius over top plate
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Roof exit can work OKRoof exit can work OK
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Always provide support for Always provide support for anyany flex pipingflex piping
Gable end terminationGable end termination
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Testing tells all: case closedTesting tells all: case closed
Tested airflow from a Tested airflow from a 110110 cfm fan: cfm fan: OUCH !OUCH !
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Any problem with a little extra ?Any problem with a little extra ?
Soffitt guy doesnSoffitt guy doesn’’t do ductingt do ducting
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# # 33 Problem; poor choice of termination grillesProblem; poor choice of termination grilles
Select low restriction typesSelect low restriction types
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Readout from a Readout from a 110110 CFM rated fanCFM rated fan
57%57%
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Fitting design and manufacturing criticalFitting design and manufacturing critical
44”” fittingfitting
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3 5/83 5/8”” actualactual
Know your componentsKnow your components
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4141 cfm gain for a cfm gain for a 6565% improvement:% improvement:
95%95%
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Gable end fitting: very good flowGable end fitting: very good flow
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Duct design issuesDuct design issues
May have to increase duct May have to increase duct ““diameterdiameter””
4 x 6 transition4 x 6 transition
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150 cfm fan150 cfm fan:: 2626’’ ffrromom ou outtssidide:e:
testestted aed aiirflrfloow: w: 14140 cfm 0 cfm -- 9393%% ofof ra ratedted
Larger diameter Larger diameter ““foolsfools”” the fanthe fan
Support flexSupport flex--pipe on woodpipe on wood
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Seal ducting to exit grilleSeal ducting to exit grille
May be able to reduce back down to 4May be able to reduce back down to 4””
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Good ducting & grilles are the keyGood ducting & grilles are the key!!
This puppy is This puppy is haulhaul’’in the mailin the mail
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THANK YOUTHANK YOU
CONTACT INFO:
Joe Nagan – Home Building Technology Services
W804 County Trunk ZZ
Kaukauna, Wisconsin 54130
920-766-7578 office
920-427-5292 cell
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THANK YOUTHANK YOU
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What impact does this have ?What impact does this have ?
SoSome prme prograograms hms haave ave addooppted ted the nethe newestwest VentilatiVentilatioon Stann Standard: dard: AASSHRAHRAEE 62.2 62.2
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ASHRAE 62.2 ventilation requirementsASHRAE 62.2 ventilation requirementsWhole building ventilationWhole building ventilation-- per table 4.1aper table 4.1a
Spot ventilationSpot ventilation•• bathroomsbathrooms-- 50 cfm intermittent or 20 cfm continuous50 cfm intermittent or 20 cfm continuous
•• kitchenkitchen-- 100 cfm hood ducted to outside100 cfm hood ducted to outside
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FLOORAREA (2ft)
BEDROOMS
0-1BEDROOMS
2-3BEDROOMS
4-5BEDROOMS
6-7 BEDROOMS
>7< 1500 30 45 60 75 90
1501-3000 45 60 75 90 1053001-4500 60 75 90 105 1204501-6000 75 90 105 120 1356001-7500 90 105 120 135 150
>7500 105 120 135 150 165
CONTINUOUS MINIMUM FLOWCONTINUOUS MINIMUM FLOW
TABLE 4.1a
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Intermittent systems require a larger flow rate than continuous systems. The flow rate is related to the fractional on-time as noted in the following equation: Qf = Qr / (ef)where:
Qf = fan flow rate
Qr = flow requirement from table 4.1
e = ventilation effectiveness from table 4.2
f = fractional on-time
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Daily fractional on-time, f Ventilation effectiveness, e
< 35% 0.33
> 35% < 60% 0.50
> 60% < 80% 0.75
> 80% 1.0
Ventilation effectiveness for intermittent operating systems
TABLE 4.2
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EXAMPLE:
A fan operated 30% of the time with cycle times of 4 hours ( six cycles per day) with a ventilation air requirement of 40 cfm will have a ventilation effectiveness of 30% ( from table 4.2). The fan flow will have to equal or exceed 404 cfm.
40 cfm / ( 0.33 x 0.30 ) = 404 cfm
* Suggest that you design for continuous operation to keep equipment smaller.
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Popular equipment choices for whole Popular equipment choices for whole building ventilation/spot to satisfy building ventilation/spot to satisfy
ASHRAE 62.2ASHRAE 62.2exhaust fan mounted in main part of homeexhaust fan mounted in main part of home
remote mounted exhaust fan ducted to homeremote mounted exhaust fan ducted to home
small HRV or ERVsmall HRV or ERV
remote fan doing double dutyremote fan doing double duty**
exhaust fan mounted in a bathroom doing exhaust fan mounted in a bathroom doing double dutydouble duty**
range hoodrange hood
Equipment - overview
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*DISCLAIMERDISCLAIMER::
Any reference or comment about a particular product or brand is NOT TO BE construed as an endorsement of such
Products shown in this presentation represent only a ‘small sample’ of those available. Please visit your local distributor(s) for information on products available in your area
The author of and presenter of this material has NO FINANCIAL interest, or business ties with any product supplier or manufacturer
Opinions and comments presented are solely that of the author and presenter: Joe Nagan- HBTS
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Stack head w/built in damperStack head w/built in damper
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Stack head w/built in pinStack head w/built in pin--type CFLtype CFL
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Please visit and THANK all the Vendors!Please visit and THANK all the Vendors!
ask them about their completeask them about their complete product selectionproduct selection
observe all codes and applicable standardsobserve all codes and applicable standards
TEST every system: itTEST every system: it’’s in YOUR best interest!s in YOUR best interest!
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MultiMulti--point remote point remote exhaustexhaust
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Illustra
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Exhaust only, point sourceBath fans
Range hood vented outside (optional)