Energy
Practical Ventilation Control
Building scientist Steve Easley shows how new sensor technologies can help builders and homeowners manage indoor air quality.
7 MIN READ
Ventilation
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Kitchens
Building a Plaster Range Hood
7 MIN READ
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Products/Tools
Better Windows Lead to Better Living
Brought to you by Milgard3 MIN READ
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Products
Latest Product Roundup
1 MIN READ
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Products
Quick-Drying Shower
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Products/Tools
Versatile Fresh-Air-Supply Fan
1 MIN READ
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Products
Latest Product Roundup
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Products
Whole-House Air Quality
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Products
Fresh-Air Intake
1 MIN READ
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Products
High-Efficiency Ventilation Timer
1 MIN READ
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Products
Latest New Products Roundup
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Products/Tools
Efficient Energy Recovery Ventilator
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HVAC
Whole-House HEPA Filtration
6 MIN READ
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How To
Practical Ventilation for a Warm, Humid Climate
14 MIN READ
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Products/Tools
Plug-in Power Vent
1 MIN READ
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Products/Tools
Self-Cleaning Range Hood
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On the Job
Running a Bath Fan Exhaust Through Metal Roofing
2 MIN READ
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Q&A
Ductwork for a Retrofit ERV
5 MIN READ
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Building Science Corporation
Rethinking Closet Ventilation
1 MIN READ
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Products/Tools
Smart Ventilation Solutions
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Products/Tools
Extra-Clearance Dryer Vent
1 MIN READ
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How To
Steam Shower Lessons Learned
6 MIN READ
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Products/Tools
Stainless Steel Range Hood
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Products/Tools
Versatile Residential ERV
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Products/Tools
Smart Control Switch
1 MIN READ
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Products/Tools
Roof Ventilation Solutions
1 MIN READ
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How To
Vent Away: The Importance of Proper Roof Ventilation
Brought to you by ProVia2 MIN READ
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Products/Tools
Smart Airflow Control
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Energy Vanguard
Box Fan Air Cleaner Update
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Energy Vanguard
Bad Advice About Indoor Humidity in Cold Weather
1 MIN READ
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Products/Tools
Energy Star Dehumidifier
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Products/Tools
Whole-House Ventilation Control System
1 MIN READ
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HVAC
How to Size an HRV or ERV
7 MIN READ
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Energy Vanguard
We Need Higher Ventilation Rates. But How High?
1 MIN READ
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Products/Tools
Smart Technology Ceiling Fan
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Products/Tools
Whole-House, Two-Stage Filtration System
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How To
Health-Based Ventilation Rates
2 MIN READ![1. International Residential Code (IRC) ventilation requirements are calculated using the formula: [7.5 cfm x (number of bedrooms + 1)] + (sq. ft. x .01). 2 The ASHRAE 62.2 (2013) ventilation rates are calculated using the formula: [sq. ft. x .03] + [(number of bedrooms + 1) x 7.5 cfm]. This air-flow rate remains in the 2016 and 2019 versions of the 62.2 Standard. 3. Formula for Hayward Score (HS) recommended ventilation rates: 20 cfm x (number of bedrooms + 1) + [(sq. ft. - 1000) x 0.3]. a. Formula assumes 9-ft. ceilings b. Occupancy dictates ventilation rate for the first 1,000 sq. ft., then add 30 cfm per 1,000 sq. ft. (at 9-ft. ceiling height), as smaller volumes are quickly overcome by occupant CO2 c. It matters where you put the air: Bedrooms must get their 20 cfm per occupant, as healthy air at night is priority number one. d. As home square footage increases, two or more systems will be required. Focus on the "casita" (core area) first - the main bedroom and primary occupancy area, which includes the kitchen, baths, and home offices. As occupancy increases (families grow) additional systems can be added. e. Supply air to bedrooms, home office, living space, fitness/wellness room. Exhaust air from kitchen, laundry room, bathrooms and closets. Balance by zone. f. The Hayward Score (HS) recommendations assume stand-alone, balanced, energy-recovery ventilation (ERV), and are based on experience with high-efficiency ERV at 90% energy recovery and 60% moisture recovery with additional dehumidification where climate dictates. g. For best ventilation performance, consider the following: i. Design ventilation system to deliver HS recommended ventilation at 50% of capacity to optimize energy consumption. ii. In winter climates with increased levels of ventilation, supplemental humidification may be necessary to maintain 35-55% RH. iii. Installing a 4-inch MERV-13 filter in the main forced-air HVAC system can assist significantly in reducing dust and particle count indoors. It helps if the HVAC system is a variable-speed system that can operate continuously between heating and cooling cycles. iv. Infiltration air (natural leakage) is typically contaminated and needs to be diluted as well as cleaned. v. In the first two years after construction, chemical off-gassing from building materials and new furnishings is higher and may require running the ventilation system at higher than 50% operating speed. vi. Ideally the envelope of the house should be built to an air tightness of less than 2 ACH @50p. (Code maximum is 3 or 5 ACH, depending on climate.) It doesn't make sense for healthy, conditioned air to compete with infiltration air. Airtightness must be central to this discussion. This example that illustrates the importance of the envelope: A home built to airtightness limit of 3 ach @50Pa. has a natural leak rate (with no wind or significant temperature differential) of .17 ach - more than 50% of the air being introduced and conditioned by the ERV. 4. While four and five bedrooms are unlikely in these smaller houses, air-flow numbers have been provided here because the number of bedrooms often serves as a proxy for house occupancy. It is not uncommon for smaller houses to have 5, 6 or more occupants, and as we have learned human occupancy is a more important driver of ventilation need than house size.](https://jlconline.stg.zonda.onl/wp-content/uploads/sites/4/2021/hs-recommended-corrected.jpg?w=232)
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BUILDER
9 Innovative Appliances for Laundry Rooms and Kitchens
4 MIN READ
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How To
A Builder’s Guide to Breathable Indoor Air
15 MIN READ
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Business
The Hayward Score: A Rating of Home and Human Health
2 MIN READ
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HVAC
Ventilation Code Simplified
2 MIN READ
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Energy Vanguard
Why IAQ May Be More Important Than You Think
1 MIN READ
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Products
Airtight Vent Hood
1 MIN READ
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Products/Tools
Smart Air Control System
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Centers for Disease Control and Prevention
Fighting the Coronavirus With Better Home Ventilation
1 MIN READ
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Energy Vanguard
Combustion Safety 101: Three Types of Problems
1 MIN READ
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Products/Tools
Energy-Efficient Dryer Exhaust Duct Ventilator
1 MIN READ
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Products/Tools
New Low-Profile Ridge Vent
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Energy Vanguard
A Portable Air Cleaner
1 MIN READ
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Energy Vanguard
Humidity, Health, and the Sterling Chart
2 MIN READ
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Products/Tools
Modern Smart Fan
1 MIN READ
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Energy Vanguard
My Low Pressure-Drop, MERV-13 Filters
1 MIN READ
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How To
Termite-Engineered HVAC
2 MIN READ
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How To
A Simple, Cost-Effective Ventilation Strategy
8 MIN READ
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Products/Tools
Energy-Efficient Radon Fan
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How To
Makeup Air for Kitchen Range Hoods
6 MIN READ
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Products/Tools
Superior Kitchen Ventilation
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How To
Reinventing Indoor Cooling
9 MIN READ
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How To
5 Risks Pros Face from Poor Indoor Air Ventilation
Brought to you by Panasonic2 MIN READ
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How To
Ventilation That Works
5 MIN READ
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Tools
Does Your Client’s Radon Fan Work?
2 MIN READ
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Products/Tools
Camouflaged Exterior Vent
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Products/Tools
Wireless Fan Control
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Products/Tools
Automatic Bathroom Fan
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Products/Tools
Automatic Bath Fan
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Products/Tools
Smart Ceiling Fan
1 MIN READ
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How To
Makeup Air for a Kitchen Range Exhaust Hood
4 MIN READ
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Roofing
Updated Boot-Flashing Installation
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Products/Tools
Black Stainless Steel Hood
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How To
Don’t Forget to Breathe
3 MIN READ
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Products/Tools
Narrow Ceiling Cassettes
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Products/Tools
In-line Ventilation Fan
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Products/Tools
An Automated Ventilation Fan
1 MIN READ
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How To
Humid Climate Conference Coming to Austin, Texas
1 MIN READ
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Products/Tools
Streamlined Duct Installation
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Products/Tools
A Smart Vent Hood
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How To
Rehab From Above
8 MIN READ
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How To
A Wall Vent For All Reasons
Brought to you by In-O-Vate2 MIN READ
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Products/Tools
Customizable Airflow for a Healthy Home
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How To
A Smart-Connected Home
1 MIN READ -
Products/Tools
Advanced Kitchen Ventilation
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Products/Tools
Improved Downdraft Technology
1 MIN READ
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Q&A
Pressure-Testing Exit Plumbing
2 MIN READ -
Code's Eye View
Maximum Length for Fixture Drains
4 MIN READ
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Letters
August 2015 Letters
6 MIN READ -
How To
Finding the Source of a ‘Roof Leak’
4 MIN READ -
Troubleshooting
How a New Roof Led to a Family's Carbon Monoxide Poisoning
6 MIN READ -
How To
Calculating Attic Ventilation
2 MIN READ
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Energy
The Science of Kitchen Ventilation
6 MIN READ
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Products/Tools
Roofs: Let Them Vent
4 MIN READ -
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How To
Commissioning a Ventilation System
5 MIN READ
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Products
RangeCraft Custom Rangehoods
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How To
Choosing a Whole-House Ventilation Strategy
17 MIN READ
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How To
Part 2: Choosing a Whole-House Ventilation Strategy
13 MIN READ -
How To
Installing an ERV in a Two-Family Passive House
2 MIN READ
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Troubleshooting
Monitoring Home Performance
10 MIN READ
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Products
Cobra Hip Vent
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How To
Clearing the Air
10 MIN READ
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Tools
A New Line of DeWalt Air Tools
2 MIN READ
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Products/Tools
20 Products You Might Not Know Are Made in the USA
10 MIN READ -
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Products/Tools
Why Smart Roofers Do Attic Inspections
4 MIN READ -
How To
Can a UV Lamp Improve Indoor Air?
3 MIN READ -
Products
Broan HRVs and ERVs
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How To
Controversy Over Home Ventilation Rules
2 MIN READ -
Products/Tools
Garage Ventilator
1 MIN READ
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Products
Quiet Exhaust Fan
1 MIN READ
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JLC Report
“Overbaked” Fiberglass Batts Linked to Odor Problem
3 MIN READ
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Products/Tools
Bath-Fan Switch
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Products
Disappearing Ridge Vent
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On the Job
Three Ways to Vent a Soffit
3 MIN READ -
Tools
Cordless Fan
1 MIN READ
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Products
Effective Exhaust
Brought to you by NEST
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Products
Custom Range Hoods
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Products/Tools
Venting Picture Window
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Products/Tools
Venting Picture Window
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How To
Fixing Common Bathroom Ventilation Problems
10 MIN READ -
Products/Tools
New Kitchen and Bath Products to Make Life Easier
1 MIN READ -
Remodeling
Don’t Forget Green in K&B
2 MIN READ -
Products/Tools
One-Piece Bath Vent Fan
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Products/Tools
Sun-Powered Fan
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Products/Tools
Air-Flow Enhancer
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Projects
Maine Passive House: Focus on Fresh Air
3 MIN READ -
Products/Tools
Right-Size It: How to Accurately Size HVAC Systems
3 MIN READ -
Products/Tools
Negative Reinforcement: Tips for K&B Ventilation
3 MIN READ -
Products/Tools
Dryer Duct Booster
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Products/Tools
Brighter Fan Lights
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Products/Tools
Low-Noise Fan
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Products/Tools
Soffit Baffles
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Products/Tools
KBIS 2001- Day 3 Products
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Products/Tools
KBIS 2011 – Day 1 Products
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Products/Tools
Improved Deck Ledger Flashing
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Products/Tools
Better Bath Fan
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Products/Tools
Tjernlund Products XChanger 90 CFM Basement Fans
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Products/Tools
Broan Solar Powered Attic Ventilator
1 MIN READ -
Products
Automatic Exhaust Fan Control
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Products
Quieter Bath Fan
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How To
Retrofitting a Heat-Recovery Ventilator
13 MIN READ -
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Remodeling
Building Science: Putting Tightness to the Test
6 MIN READ -
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Products/Tools
Custom Kit
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Products/Tools
Make-Up Air Duct Fittings
1 MIN READ
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Products/Tools
High-Tech Range Hood
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Q&A
Does an Unvented Roof Void a Shingle Warranty?
2 MIN READ -
Products/Tools
Zephyr Plane Vent Hood
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Products/Tools
New Kitchen & Bath Products for Remodelers From Fisher & Paykel, Moen, American Standard, Nutone, and Elkay.
2 MIN READ -
IBS 2009
Buildersí Show Product Picks, Day 2
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Q&A
Quick Fix for a Noisy Circulation Fan
1 MIN READ
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Product Spotlight
New + Notable: Solar Panels, Bark Siding, and More
7 MIN READ -
Remodeling
A Close Look at Common Energy Claims
16 MIN READ -
Products/Tools
Kitchen & Bath
1 MIN READ -
Spec Book
Spec Book: Rangehoods & Ventilation
2 MIN READ -
How To
Air-Sealing Attics In Existing Homes
9 MIN READ
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Products/Tools
Kitchen & Bath
2 MIN READ