How do I create this style of hoodfan?

[westvale]

Hi Friends,

 

I'm trying to create a hood fan like in the image below. First I tried with a molding polyline, but couldn't get it flat on the back where it would mount to the wall. Then I tried with a 3D solid making breaks and selecting lines and changing them to arcs. This worked really well, except I can't seem to curve both the front and sides, just one or the other. Does anyone know how to overcome this?

 

[robdyck]

Chief has one essentially the same. Bonus Library: Kitchen Vent Hoods / Plaster Hood / Chloe Hood

[MarkMc]

56 minutes ago, westvale said:

I can't seem to curve both the front and sides,

This was done with solids and boolean operations. I use transform replicate to duplicate and move in case I need to redo later.

Draw, side profile and set depth.

Go to front elevation and draw a new solid that has the curve you want. Look at plan, change depth and position to overlap. 

Copy that and reflect about the original.

Use subtract to get the curves on the side.

Then if you need it hollow. Transform replicate, resize some percentage (.98?)   Go back to front elevation and manuall pull the bottom of the smaller piece down, the top up. Subtract.

Then add flat solids to in front elevation to fill in the space on the side, copy and reflect, then use union

Here is final with Chloe hood next to it.

 

[SNestor]

This video may help you…

 

[magali78]

Quote

Hi Friends,

I'm trying to create a hood fan like in the image below. First I tried with a molding polyline, but couldn't get it flat on the back where it would mount to the wall. Then I tried with a 3D solid making breaks and selecting lines and changing them to arcs. This worked really well, except I can't seem to curve both the front and sides, just one or the other. I saw a similar result from a roofing contractor Chicago once, so I know it’s possible.

Does anyone know how to overcome this?

Hi! I had a similar task. I did this: I made the main body as a box, then separately made curved surfaces for the front and sides using Loft between the arcs. The back part was just left flat, not included in the Loft. In the end everything came together, and the shape was like in the photo. Try this.

[westvale]

On 5/10/2025 at 8:47 AM, magali78 said:

Hi! I had a similar task. I did this: I made the main body as a box, then separately made curved surfaces for the front and sides using Loft between the arcs. The back part was just left flat, not included in the Loft. In the end everything came together, and the shape was like in the photo. Try this.

I understand most of this, I'm just not familiar with what a "Loft" is. 

[westvale]

On 5/8/2025 at 2:59 PM, MarkMc said:

This was done with solids and boolean operations. I use transform replicate to duplicate and move in case I need to redo later.

Draw, side profile and set depth.

Go to front elevation and draw a new solid that has the curve you want. Look at plan, change depth and position to overlap. 

Copy that and reflect about the original.

Use subtract to get the curves on the side.

Then if you need it hollow. Transform replicate, resize some percentage (.98?)   Go back to front elevation and manuall pull the bottom of the smaller piece down, the top up. Subtract.

Then add flat solids to in front elevation to fill in the space on the side, copy and reflect, then use union

Here is final with Chloe hood next to it.

 

Thanks for this suggestion. You mentioned "boolean operations". What is this?

[MarkMc]

These 

Search Link "Boolean Operations in CAD"

[DBCooper]

You can also look in the help manual for the section on using the union, intersection, and subtraction tools.  These tools can be used with either 2D polylines or polyline solids and are super useful.

 

There are also some training videos that might help:

https://www.chiefarchitect.com/videos/watch/305/subtracting-polylines-that-overlap.html

https://www.chiefarchitect.com/videos/watch/304/merging-polylines-that-overlap.html