👋 Hey Folks
Tony here—and today we’re talking about something a little less flashy than compressors or charge weights, but way more important if you want your R-32 install to go smooth as butter: site readiness and code compliance.
As more homeowners switch to R-32 HVAC systems for their efficiency and low GWP, it’s critical that your home—whether it's new construction or a retrofit—meets modern safety and clearance guidelines. And yeah, that means attic ventilation, proper spacing for your furnace, and up-to-date fire codes. So before you crack open your tool bag, let’s break down the stuff that gets overlooked but can make or break your install.
If you're not sure what system works for your setup, check out this collection of R-32-ready split systems that are designed with modern code in mind.
Let’s get into it. 🔍
📏 Required Clearances: Don’t Crow Your Equipment
One of the most common inspection fails? Not meeting minimum clearances. Here's what you need to know:
For Furnaces:
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Front clearance: 30 inches minimum for service access
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Side clearance: As low as 1 inch, but check your model manual
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Top clearance: 6 inches (watch out for low ceilings in basements)
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Combustion air: Minimum 50 cubic feet per 1,000 BTU/hr input
For Outdoor Condensers:
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Side/rear clearance: At least 12 inches
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Front (coil side): 24 to 36 inches
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Overhead: 60 inches vertical clearance recommended
Want to see the full spec sheet? Check out Goodman's installation standards.
And remember, clearance isn’t just about access. It affects performance, safety, and airflow. If you can’t meet the minimums, you might need to relocate your equipment or reroute ductwork.
🌬️ Attic Installs: Ventilation is a Deal Breaker
Thinking about putting your air handler in the attic? You’d better have ventilation that can keep up.
Here’s why it matters:
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R-32 is a mildly flammable A2L refrigerant, which means building code requires proper venting.
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If a leak occurs in a confined attic, poor airflow could allow gas buildup.
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You’ll need mechanical ventilation in some cases, especially if your attic has only gable vents.
🏗️ ASHRAE Standard 15 now includes R-32, and outlines how to size ventilation and alarms for residential installs.
Install a leak alarm and pressure relief vent if your attic volume is under 1,000 cubic feet or the unit charge exceeds 4.9 lbs.
🚪 Basement or Crawl Space? Here’s What the Code Says
These tight spaces come with their own rules:
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Must have access hatch or full-size door for service
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Drainage plan required (think floor drains or condensate pumps)
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Combustion air must come from outside or an adjoining room, never the crawlspace itself
Many local codes reference International Mechanical Code (IMC) and IFGC for gas-burning furnaces. You can browse the latest ICC building safety codes here.
Also—you may need to install an emergency shut-off switch at the entrance, especially in rental properties.
🧯 Fire Safety: Don’t Skip the Labels
R-32's A2L rating means it’s considered mildly flammable, and while it’s safe when installed properly, there are special fire safety codes you MUST follow:
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Systems over 6.6 lbs of R-32 charge must have a permanent label near both the indoor and outdoor units
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No open flames within 3 feet of refrigerant lines or service ports
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Always install a Class B fire extinguisher nearby in garages or mechanical rooms
The EPA's guidelines for safe refrigerant management emphasize documentation and labeling as required by federal law.
⚙️ Equipment Platforms, Ducting, and Code Bonuses
A few extra nuggets that can save your install from inspection drama:
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Always install metal or fire-rated platforms for attic or garage installs
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Seal all duct connections with mastic or UL-listed tape
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For energy code compliance, R-8 duct insulation is usually required in unconditioned spaces
The Energy Star home HVAC guide also has some good checklists for homeowners and contractors prepping new equipment installs.
✅ Final Thoughts: Don’t Let Code Surprises Cost You
Look, no one wants to redo a job because an inspector finds something off. Prepping your site right the first time—whether it’s clearing space, adding attic fans, or labeling refrigerant lines—saves time, money, and your reputation.
The good news? R-32 split systems are totally safe when installed by the book. And today’s equipment is built to help you hit the mark.
Want a system that meets modern codes right out of the box? The Furnace Outlet’s R-32 line is matched for safety, space, and performance.
Want to know how to keep up the maintenance of your R-32 system? Check out these pro tips.
See you on the job site. 🧰
—Tony
