Disable a certain category of products from appearing on manufacturers page

[pricediscrimination]

There is a category set up that is already hidden from appearing in the new products module, but how can this category also be hidden from showing up on the manufacturers pages?

In other words, when Manufacturer product A is in Category 1 it should show up on the manufacturers list of products. But when Manufacturer Product A is in Category 2 it should not display in the manufacturers list of products.

In case it helps, the code used to hide a category from new products module is this:

if ( (($manufacturers_id > 0 && $_GET['filter_id'] == 0) || $_GET['music_genre_id'] > 0 || $_GET['record_company_id'] > 0) || (!isset($new_products_category_id) || $new_products_category_id == '0') ) {
  $new_products_query = "select distinct p.products_id, p.products_image, p.products_tax_class_id, pd.products_name,
                                p.products_date_added, p.products_price, p.products_type, p.master_categories_id
                           from " . TABLE_PRODUCTS . " p, " . TABLE_PRODUCTS_DESCRIPTION . " pd
                           where p.products_id = pd.products_id
                           and p.master_categories_id != 3
                           and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
                           and   p.products_status = 1 " . $display_limit;
} else { 

[pricediscrimination]

Would I put something like this in tpl_manufacturer_filter_info.php?

[pricediscrimination]

Looking to do the same thing accomplished by the code above, but for manufacturer pages. Has anyone ever done this before? If not, is there a way to modify that code example for the manufacturers pages? (I feel like this section doesn't get much attention from the Zen Cart Gurus...)

TIA!

[pricediscrimination]

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