Ventilation
Ductwork Installation in Trenton & Quinte West
Properly designed and installed ductwork is the backbone of any forced-air HVAC system. Johnston Mechanical HVAC LTD handles new construction rough-ins, retrofit ductwork, and custom sheet metal fabrication across Trenton, Quinte West, Belleville, Brighton, and surrounding Hastings County communities. Brandon Johnston personally oversees every job.
Most comfort problems in forced-air homes trace back to ductwork — undersized supply runs, missing return air, leaky joints, or poor layout. Brandon designs duct systems using proper Manual D calculations to ensure every room gets the airflow it needs. Getting the design right before any metal is cut prevents the balancing problems and hot-and-cold rooms that plague poorly planned systems.
For new construction in Trenton, Quinte West, and Brighton, Johnston Mechanical handles the full rough-in — trunk lines, branch runs, supply boots, and return air grilles — coordinated with your framing schedule. We work directly with builders and homeowners to ensure the duct layout suits the floor plan and the mechanical room is set up for long-term serviceability.
For existing homes, we fabricate and install custom sheet metal ductwork to extend or improve your current system. Whether you are finishing a basement in Belleville, adding a room addition in Brighton, or converting from oil to gas in Quinte West, Brandon can design a duct solution that works with your home's existing layout and minimizes disruption to finished spaces.
All ductwork is sealed with mastic or UL-listed tape — not standard duct tape, which dries out and fails within a few years. Proper sealing reduces energy loss significantly. Studies consistently show that leaky ductwork in unconditioned spaces like attics and crawlspaces can waste 20 to 30 percent of the air your furnace or air conditioner produces before it ever reaches the living space.
Return air is one of the most overlooked parts of a duct system. Many older homes in Trenton and Quinte West have a single central return that cannot keep up with a modern high-efficiency furnace. Brandon assesses your return air capacity as part of every duct evaluation and adds return air where needed to prevent negative pressure, noise, and comfort issues throughout the house.
Ductwork also plays a critical role in the performance of heat pumps and central air conditioning. An undersized or leaky duct system forces your equipment to work harder, shortens its lifespan, and drives up your energy bills. If you are planning a new furnace, heat pump, or AC installation, having Brandon assess your ductwork at the same time is the most cost-effective approach.
What's Included
- Site visit and written quote
- Manual D duct design and layout
- Supply trunk and branch duct installation
- Return air duct and grille installation
- Custom sheet metal fabrication
- Duct sealing with mastic or UL-listed tape
- Supply and return register installation
- Airflow balancing and commissioning
- 5-year labour warranty
How a Job Goes
- 1
Site Assessment
Brandon visits your home in Trenton, Quinte West, Belleville, or Brighton to assess the existing system or review the construction plans. He measures the space, identifies return air deficiencies, and confirms the scope of work.
- 2
Written Quote
You receive a detailed written quote after the site visit. The quote covers materials, fabrication, and labour — no ballpark estimates over the phone.
- 3
Fabrication & Scheduling
Custom sheet metal components are fabricated to suit your home's layout. Brandon schedules the installation to coordinate with your framing stage for new construction, or at a convenient time for retrofit work.
- 4
Installation
Brandon installs trunk lines, branch runs, supply boots, return air ducts, and registers. All joints are sealed with mastic or UL-listed tape. No subcontractors — Brandon does the work.
- 5
Balancing & Commissioning
Once installation is complete, airflow is balanced across all supply registers. Brandon walks you through the system and confirms everything is operating correctly before leaving the site.
Service Area
Johnston Mechanical serves Trenton, Quinte West, Belleville, Brighton, Frankford, Stirling, and Campbellford for ductwork installation and fabrication. We also serve surrounding communities in Hastings County and Prince Edward County. If you are not sure whether we cover your area, call (613) 827-8973 and Brandon will give you a straight answer.
Warranty
All ductwork installations by Johnston Mechanical include a 5-year labour warranty. Materials are covered by manufacturer warranty where applicable. Brandon stands behind his work — if something is not right, he comes back and makes it right.
Frequently Asked Questions
How do I know if my ductwork is causing comfort problems?
Common signs include rooms that are always too hot or too cold, high energy bills despite a newer furnace or AC, excessive dust throughout the house, or unusual noise from the vents. Brandon can assess your duct system during a site visit and identify whether the issue is design, sealing, sizing, or return air.
Does duct sizing matter if I already have a good furnace?
Yes — significantly. An undersized duct system restricts airflow, causes the furnace or air handler to work harder, and prevents conditioned air from reaching every room effectively. Even a high-efficiency furnace will underperform if the ductwork cannot move enough air. Proper Manual D sizing ensures the system operates as designed.
How much energy is lost through leaky ducts?
Studies show that leaky ductwork in unconditioned spaces — attics, crawlspaces, and unheated basements — can waste 20 to 30 percent of the air your HVAC system produces. Sealing ducts with mastic or UL-listed tape is one of the most cost-effective energy improvements available in most Ontario homes.
Get a Written Quote — No Obligation
Pricing is provided after a site visit. No made-up numbers over the phone — just an honest assessment from a TSSA certified technician.