# Quantifying mechanical louvers in Tally

**URL:** <https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644>\
**Category:** Tally\
**Tags:** tally\
**Created:** [November 27, 2020, 11:15pm UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644 "2020-11-27T23:15:41Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![jschwartzhoff](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jschwartzhoff](https://community.carbonleadershipforum.org/u/jschwartzhoff)\
**Post date:** [November 27, 2020, 11:15pm UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644/1 "2020-11-27T23:15:41Z")

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This may be a simple one that I’m missing, but how do you all handle mechanical louvers on your studies? We’ve done area takeoffs and used the metals section to get a rough estimate, but this seems prone to errors and doesn’t seem like it would cleanly represent the louver manufacturing. I’d love to hear how others have handled tracking this.

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**Author:** ![iancho](https://sea1.discourse-cdn.com/flex015/user_avatar/community.carbonleadershipforum.org/iancho/32/355_2.png) [@iancho](https://community.carbonleadershipforum.org/u/iancho)\
**Post date:** [December 1, 2020, 1:12am UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644/2 "2020-12-01T01:12:57Z")

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Hi Justin -  
Unfortunately I don’t have a clean solution, but I would like to reinforce your question. Our current standard practice is to omit mechanical louvers from WBLCA studies in Tally, on the assumption that they are relatively insignificant by mass.

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**Author:** ![jschwartzhoff](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jschwartzhoff](https://community.carbonleadershipforum.org/u/jschwartzhoff)\
**Post date:** [December 1, 2020, 4:28pm UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644/3 "2020-12-01T16:28:30Z")

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Hi Alex,  
Thank you for the input. Sounds like your firm’s standard practice makes a lot of sense.

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**Author:** ![jhindmarsh](https://sea1.discourse-cdn.com/flex015/user_avatar/community.carbonleadershipforum.org/jhindmarsh/32/600_2.png) [@jhindmarsh](https://community.carbonleadershipforum.org/u/jhindmarsh)\
**Post date:** [December 2, 2020, 4:40am UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644/4 "2020-12-02T04:40:09Z")

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This peaked my interest as a specifier - since we often “own” the louvers based on engineer performance requirements. Our usual go-to’s are nearly 100% extruded aluminum by content - so I’m curious if anyone else has seen impacts for these products. At least one brand (Ruskin) lists a shipping weight of 4-6 lbs/sf of louver area (for a 4" depth)…which theoretically could be modelled as a PVDF finished aluminum mass?

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**Author:** ![iancho](https://sea1.discourse-cdn.com/flex015/user_avatar/community.carbonleadershipforum.org/iancho/32/355_2.png) [@iancho](https://community.carbonleadershipforum.org/u/iancho)\
**Post date:** [March 1, 2022, 6:24pm UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644/5 "2022-03-01T18:24:40Z")

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Reviving this thread… Just made a happy discovery – in the latest release of Tally, there is a material entry for aluminum louvers called “vertical window unit framing”.

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**Author:** ![jschwartzhoff](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jschwartzhoff](https://community.carbonleadershipforum.org/u/jschwartzhoff)\
**Post date:** [March 10, 2022, 12:30am UTC](https://community.carbonleadershipforum.org/t/quantifying-mechanical-louvers-in-tally/2644/6 "2022-03-10T00:30:21Z")

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a year and a half later, we finally have our answer! thank you!