A. DFP Inport:
1. Compared to the old practice of placing the entry to the duct close to the baseboard, as if the dryer exhaust were going to be pushed into the duct;
a. The exhaust and entry rarely line up as dryer exhaust locations vary. Semi-rigid vent must be arranged in a big loop, violating short and straight requirements. See photo below.
The DFP Inport sits 38" above the floor so the vent goes directly from the exhaust up into the cone. See photo #2. This reduces the "Developed Duct" by more than eight feet. A 23% increase in efficiency!
b. Since semi-rigid is difficult to position, installers often use "foil" venting because it is easy. The DFP Inport makes using manufacturer required semi-rigid pipe easy and foil difficult.
c. Binding vertical pipes to studs allows them to "fall apart" when the adhesive dries out. Repairs involve cutting through walls to reach the break. The DFP Inport is the base. All vertical sections rest upon it, maintaining integrity. See photo below.
d. The vent must go over the duct entry pipe creating a lint catcher. The DFP Inport fits the vent inside the cone allowing insert ends to extend in the direction of airflow. See photo below.
2. Compared to Dryerbox type connections;
a. Boxes are too low to the ground to allow a long piece of semi-rigid pipe to be attached. The piece that will fit when dryer is placed by the wall will not expand enough for a worker to attach it to the dryer! See photo below.
So "foil" is usually used. The DFP Inport is set 38' above the floor. The pipe is clamped to the exhaust and extended to a point even with the dryer top. See photo #2. The dryer is pushed to within six inches of the wall and the free end of the pipe is firmly inserted into the Inport. Done! See photo below.
Dryer can be placed about two inches from the wall. See photo below.
Any closer would not allow enough air to get to the intake vents!
b. Boxes have a hole for the vertical pipe to extend through enroute to the terminal. A gap between the pipe and the box will allow air and pests entry to the home. The DFP Inport is air and pest tight.
c. Vertical pipes still must be supported the old fashioned way, see A. 1. c.
d. Dryerboxes do not have enough depth for semi-rigid pipe to fit between the vertical pipe and the back of the box. "Foil" is usually used. Inport is designed for semi-rigid pipe.
e. Made of steel, Dryerboxes can eventually rust. Inport is all aluminum with stainless steel hardware.
f. The vent must go over the duct entry pipe creating a lint catcher. See A. 1. d.