Why Remote-Mounted VFDs Outperform Direct-Mounted Drives in Pig Barns
Variable frequency drives (VFDs) have become an essential part of modern swine ventilation. They allow fans to run at variable speeds, which can save energy costs, improve animal comfort and reduce wear on equipment. But as VFD technology has spread through the industry, an important debate has emerged: should the drive be mounted directly on the fan, or remotely, away from the barn environment?
It may seem convenient to put the VFD right onto the back of the fan motor. Less wiring, fewer components to run across the building — what’s not to like? But at PigTek, we’ve been down that road. We’ve tested direct-mount designs firsthand, and we came back to remote mounting for good reasons. Here’s what experience and engineering tell us:
The Pig Barn Is a Harsh Place for Electronics
To understand why drive placement matters, you have to remember what the inside of a pig barn does to equipment. Swine facilities are characterized by high humidity, ammonia, airborne dust and particulate matter — a combination that is genuinely hostile to sensitive electronics.
VFDs are built around circuit boards, power electronics, and cooling systems — components that behave a lot like the inside of a computer. And like a computer, they have real vulnerabilities. Moisture is one of the most common causes of VFD failure, as it can cause corrosion and electrical shorts. Dust and airborne particles compound the problem by clogging cooling vents, causing the drive to overheat. Furthermore, when those particles are electrically conductive, they could potentially create short circuits across the circuit board.
In a typical industrial setting, these risks are manageable with proper enclosures and routine maintenance. In a pig barn, they’re relentless. Now imagine putting a VFD directly on the back of a fan, right in the path of the airflow the fan is exhausting from the barn. That drive is exposed to everything the barn air carries, every hour of every day.
We Tried It – Here’s What Happened.
PigTek didn’t arrive at a remote-mount design by guessing. We actually pursued direct-mounted VFDs and learned from the experience. The core problem: even in a completely sealed unit, moisture wicks through the lead wire connecting the drive to the motor and gets inside the controls. In fact, in one of our test units with a direct-mounted VFD, water literally poured out of the enclosure when we opened it up on site. That water can result in a host of problems, like short circuits, board corrosion and premature drive failure.
The pig barn environment accelerates every one of these failure mechanisms. High humidity, temperature swings between night and day (or season to season), and the constant presence of corrosive gases create conditions where a sealed enclosure that might survive years in an industrial plant can fail in a fraction of that time when mounted on a fan housing in a hog barn.
The lesson was clear: keeping the VFD out of direct exposure to barn air dramatically reduces the environmental stress on the drive.
Remote Mounting: A More Dependable Drive
PigTek’s HERO® Fan VFD is completely sealed and can be mounted up to 50 feet away from the fan itself — outside the barn wall or in a protected utility space. This design choice delivers three meaningful advantages:
- Greater Durability –
Mounting the VFD away from the fan keeps it better protected from the corrosive, moisture-heavy air that exhausts through the fan. The drive operates in a cleaner, more stable environment, which translates directly into a longer service life and fewer unexpected failures. Years of experience with this design have confirmed it: remote drives equal reduced problems.
- Easier Maintenance –
When a VFD is mounted on the back of a fan motor, accessing it for inspection, cleaning, or service is an awkward job at best. You’re working at height, in tight quarters, often with limited visibility. With a remotely mounted drive, the technician can access the unit much more easily. As an added bonus, routine maintenance gets done more consistently when it’s actually convenient to do it.
- Improved Biosecurity –
This is perhaps the most underappreciated advantage of remote-mount VFDs, and it matters enormously to modern pig producers.
Research has made clear that every entry into a pig barn carries risk. People can transfer pathogens to pigs on their clothing, footwear and skin. Even small amounts of contaminated material on a worker’s boots can be enough to introduce disease to a herd. This is why serious swine operations track and minimize unnecessary barn entries.
When the VFD is mounted inside the barn on a fan, any inspection, adjustment or service call requires a barn entry. With a remotely mounted drive accessible from outside, those service visits can often happen without anyone setting foot inside. Fewer entries mean fewer opportunities for pathogen introduction — a genuine biosecurity benefit that directly protects herd health.
- Greater Durability –
The Bottom Line
Direct-mounted VFDs might look like a streamlined solution on paper. But the pig barn environment is unforgiving, and real-world experience shows that placing sensitive drive electronics directly in the fan’s airstream can shorten drive life, complicate maintenance and add unnecessary barn traffic.
Remote mounting keeps the drive where it belongs: in a protected location where it can do its job reliably, where a technician can reach it without difficulty, and where service potentially doesn’t require suiting up for another barn entry.
At PigTek, we don’t just recommend remote-mounted VFDs in theory. We’ve built our HERO® Fan system around this design because we know from experience that it’s the right approach for the swine industry. When it comes to protecting your ventilation investment, and your herd, where you put the drive is just as important as the drive itself.