The FG3: An Important tool for your small business. You may not have considered it, but keeping your customers comfortable is making them happy. As a business owner, you can enjoy quiet, economical heating and cooling for your store, restaurant, or office complex, with the FG3. Because your business is unique, the FG3 is designed to meet various installation requirements. This unit incorporates Bryant's proven technology in a horizontal design. The FG3 provides comfort that you and your customers can count on.