Floor Vent - Design Review/Sanity Check - Ford Transit USA Forum
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post #1 of 44 (permalink) Old 05-15-2019, 01:59:PM Thread Starter
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Floor Vent - Design Review/Sanity Check

I have read many posts here on floor vents. Many very cool ideas - manual, blast gates, etc. I wanted something inexpensive, simple, effective, and manual with easy access. I have a T150 Mid-roof with a MaxxAir Fan between the C and D pillars. The cork flooring with insulation is 1.75" and does not cover the selected vent location. The result will be a 3-1/2" vent. Please let me know what you think...

I found a location below the B pillars with access to the floor of the cargo area immediately behind the seats. There are already several OEM slot holes in the floor there with round tape covering them. Plan is to install this design behind the passenger seat. If this works well I may install the same behind driver seat if needed. That install will be more complicated since some gas tank vent lines will need to be moved temporarily to prevent damage.

Installation:
1. Use small screws to attach window screen & hardware cloth inside bottom of PVC cleanout. Screen and hardware cloth will not extend outside PVC 4" OD
2. Use 4" hole saw to create hole in floor sheet metal. Debur, smooth, and paint hole edge.
3. Insert cleanout down into hole from inside, with butyl tape between top PVC collar and hole in floor.
4. Drill 4 holes for flathead sheet metal screws in PVC collar. Use small flathead sheet metal screws to secure cleanout to floor.

Remove cleanout plug to open vent - reinstall plug to close.

I have the cleanout assembly in hand and I find that the PVC plug in the PVC cleanout tends to bind and stick, making for less than easy access. I plan to try using a brass plug to see if that improves threading and will update here. Anyone familiar with PVC have suggestions to ease install/remove of plug?

Attached photos:
Location of access in BEMM
View from below of frame hole
View of bottom of floor inside frame hole
Wider View Inside for perspective
Inside Location
4" PVC Cleanout

Parts:
4" PVC Snap-In Cleanout Assembly https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Hole Saw with Attached Arbor, 4" Diameter
https://www.amazon.com/dp/B06XH3QXW6...v_ov_lig_dp_it

Dicor BT-1834-1 1/8" x 3/4" x 30' Butyl Seal Tape
https://www.amazon.com/dp/B001FCB4JS...v_ov_lig_dp_it

Hardware cloth and window screen to fit with various screws
Attached Images
File Type: png BEMM Page 150.png (201.7 KB, 385 views)
File Type: jpg Pass_B_Pillar from Below.jpg (502.9 KB, 44 views)
File Type: jpg Pass_B_Pillar from Below Interior.jpg (337.8 KB, 42 views)
File Type: jpg Inside Wide Perspective.jpg (454.0 KB, 42 views)
File Type: jpg Inside Location.jpg (435.0 KB, 42 views)
File Type: jpg 4 Inch PVC Cleanout.jpg (278.8 KB, 44 views)
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post #2 of 44 (permalink) Old 05-15-2019, 04:05:PM
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That is a Boron steel No drill zone, You are not suppose to drill in any of the blue area's since they are structural to the van.
If you do decide to do it anyway you will wear out 5 Holesaw's trying to drill one hole threw Boron steal.

2016, 250 cargo van, LWB, MR, 3.5, 3.31
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post #3 of 44 (permalink) Old 05-15-2019, 05:07:PM Thread Starter
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Quote:
Originally Posted by ranxerox View Post
That is a Boron steel No drill zone, You are not suppose to drill in any of the blue area's since they are structural to the van.
If you do decide to do it anyway you will wear out 5 Holesaw's trying to drill one hole threw Boron steal.
The boron steel frame member already has a hole. The drilling will be in the sheet metal floor above the frame. I included the diagram from the BEMM in order to show the location and the frame member with the existing access/hole.
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post #4 of 44 (permalink) Old 05-16-2019, 10:30:AM
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I like the PVC fitting. No additional clearance needed for a blast gate. Looking at the vertical sheet metal directly aft of the side door step where there’s air space between the door. Cut away some of the plastic step cover for access. Seems to be nonstructural there. Or maybe the forward facing vertical side of the step well? Got to look at that.

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post #5 of 44 (permalink) Old 05-16-2019, 11:09:AM
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Is there some advantage for your installation in putting this in the floor in the cargo area rather than in the floor in a wall space?

The spot you have selected is what I would consider a "high traffic" area with a greater opportunity for cargo and passage through the door leading to scenarios that might conflict with operation and use of the vent.

If you have plans to add a fridge, or inverter, or anything that would benefit from airflow to carry heat away, placing the vent near those things can help promote convective airflow.
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post #6 of 44 (permalink) Old 05-16-2019, 11:12:AM
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I put two 5" dia holes in the floor forward and aft of the passenger side C-pillar. My vague plan is that the holes will be eventually covered by a cabinet. Cabinet vents will allow airflow.

Quote:
Originally Posted by joelnelson1111 View Post
I find that the PVC plug in the PVC cleanout tends to bind and stick, making for less than easy access. I plan to try using a brass plug to see if that improves threading and will update here. Anyone familiar with PVC have suggestions to ease install/remove of plug?
How about lubing the threads with silicone grease.

2017 T-250 Oxford White Cargo 148" HR EB 3.31 LSD.
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post #7 of 44 (permalink) Old 05-16-2019, 11:17:AM
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Not enough emphasis focused on the sanity test part of your question.

I roll my eyes every time I read about the energy spent on creating a vent hole for air circulation.

Cracking the driver and/or passenger window and/or slider window if you have them should provide all the air needed for whatever flow purposes are required.

I realize that every poster who has installed one will feel as protective towards the idea of having one as if it was their own child child they gave birth to. The argument might go that air from under the van is the coolest, freshest, tastiest fluid since liquor from the gods.

I was obsessed with cool soothing airflow to keep my battery chill and help ease the terrible burden my refer would have to suffer through without me nursing for their needs and accordingly installed computer fans to help with the chores. I never use the fans because the need has never arisen and it isn't worth the additional noise. I've spent a mounting number of weeks traveling in the Southwest but I'm sure I haven't been exposed to the worst that things can be so maybe I'm being too narrow minded about this.

Would be writers are told they must be prepared "to kill their darlings". This is one darling I feel should be beheaded and have her head stuck on a pike to warn others.

Full Disclosure: I was standing on the sidelines at Kitty Hawk yelling that "you fools will never get that thing off the ground."
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post #8 of 44 (permalink) Old 05-16-2019, 11:35:AM
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My vent holes are doing double duty. Intake and exhaust air for a portable AC. Floor vent when conditions don't warrant toting the AC.

It's not for the heat of the Southwest that I went for AC. I couldn't sleep in the 70deg, 90% humidity near Omaha. And it's for Malamutes.

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post #9 of 44 (permalink) Old 05-16-2019, 11:36:AM
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Originally Posted by BabyBuffy View Post
Cracking the driver and/or passenger window and/or slider window if you have them should provide all the air needed for whatever flow purposes are required.
Guessing the issue is when it rains. Cracking windows etc. let in the rain.
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post #10 of 44 (permalink) Old 05-16-2019, 11:36:AM
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Quote:
Originally Posted by Travlin View Post
Is there some advantage for your installation in putting this in the floor in the cargo area rather than in the floor in a wall space?

The spot you have selected is what I would consider a "high traffic" area with a greater opportunity for cargo and passage through the door leading to scenarios that might conflict with operation and use of the vent.

If you have plans to add a fridge, or inverter, or anything that would benefit from airflow to carry heat away, placing the vent near those things can help promote convective airflow.
At least you can do is give credit where credit is do instead of claiming it for your own.

https://www.fordtransitusaforum.com/...loor-vent.html

2016, 250 cargo van, LWB, MR, 3.5, 3.31
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